feat(backend): add moss-transcribe-cpp backend (MOSS-Transcribe-Diarize) (#10756)

C++/ggml transcription + speaker diarization + timestamps backend. Purego dlopens libmoss-transcribe.so (ggml statically linked) from moss-transcribe.cpp and serves offline AudioTranscription, parsing the [start][Sxx]text[end] output into segments with nanosecond timestamps. Adds the importer (surfaces in GET /backends/known), backend-matrix (Linux + Darwin/metal), backend/index.yaml, and a gallery entry (default q5_k GGUF from mudler/moss-transcribe.cpp-gguf). Local L0 smoke (go build + go test ./... = 16 pass, golangci-lint 0 issues) passed against the real libmoss-transcribe.so. The pre-commit coverage gate (full pkg/core + tests/e2e) could not run in the authoring sandbox (no live models, port 9090 held); CI must enforce it before merge. Assisted-by: Claude:claude-opus-4-8 golangci-lint Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>
2026-07-10 00:08:42 -04:00 · 2026-07-09 23:27:11 +02:00
parent 294487eb61
commit 94bdc825dc
20 changed files with 1511 additions and 3 deletions
--- a/.github/backend-matrix.yml
+++ b/.github/backend-matrix.yml
@@ -790,6 +790,19 @@ include:
    dockerfile: "./backend/Dockerfile.golang"
    context: "./"
    ubuntu-version: '2404'
+  - build-type: 'cublas'
+    cuda-major-version: "12"
+    cuda-minor-version: "8"
+    platforms: 'linux/amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-nvidia-cuda-12-moss-transcribe-cpp'
+    runs-on: 'ubuntu-latest'
+    base-image: "ubuntu:24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
  - build-type: 'cublas'
    cuda-major-version: "12"
    cuda-minor-version: "8"
@@ -1721,6 +1734,19 @@ include:
    dockerfile: "./backend/Dockerfile.golang"
    context: "./"
    ubuntu-version: '2404'
+  - build-type: 'cublas'
+    cuda-major-version: "13"
+    cuda-minor-version: "0"
+    platforms: 'linux/amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-nvidia-cuda-13-moss-transcribe-cpp'
+    runs-on: 'ubuntu-latest'
+    base-image: "ubuntu:24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
  - build-type: 'cublas'
    cuda-major-version: "13"
    cuda-minor-version: "0"
@@ -1760,6 +1786,19 @@ include:
    backend: "parakeet-cpp"
    dockerfile: "./backend/Dockerfile.golang"
    context: "./"
+  - build-type: 'cublas'
+    cuda-major-version: "13"
+    cuda-minor-version: "0"
+    platforms: 'linux/arm64'
+    skip-drivers: 'false'
+    tag-latest: 'auto'
+    tag-suffix: '-nvidia-l4t-cuda-13-arm64-moss-transcribe-cpp'
+    base-image: "ubuntu:24.04"
+    ubuntu-version: '2404'
+    runs-on: 'ubuntu-24.04-arm'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
  - build-type: 'cublas'
    cuda-major-version: "13"
    cuda-minor-version: "0"
@@ -3597,6 +3636,115 @@ include:
    dockerfile: "./backend/Dockerfile.golang"
    context: "./"
    ubuntu-version: '2404'
+  # moss-transcribe-cpp
+  - build-type: ''
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/amd64'
+    platform-tag: 'amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-cpu-moss-transcribe-cpp'
+    runs-on: 'ubuntu-latest'
+    base-image: "ubuntu:24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
+  - build-type: ''
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/arm64'
+    platform-tag: 'arm64'
+    tag-latest: 'auto'
+    tag-suffix: '-cpu-moss-transcribe-cpp'
+    runs-on: 'ubuntu-24.04-arm'
+    base-image: "ubuntu:24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
+  - build-type: 'sycl_f32'
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-intel-sycl-f32-moss-transcribe-cpp'
+    runs-on: 'ubuntu-latest'
+    base-image: "intel/oneapi-basekit:2025.3.0-0-devel-ubuntu24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
+  - build-type: 'sycl_f16'
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-intel-sycl-f16-moss-transcribe-cpp'
+    runs-on: 'ubuntu-latest'
+    base-image: "intel/oneapi-basekit:2025.3.0-0-devel-ubuntu24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
+  - build-type: 'vulkan'
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/amd64'
+    platform-tag: 'amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-vulkan-moss-transcribe-cpp'
+    runs-on: 'ubuntu-latest'
+    base-image: "ubuntu:24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
+  - build-type: 'vulkan'
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/arm64'
+    platform-tag: 'arm64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-vulkan-moss-transcribe-cpp'
+    runs-on: 'ubuntu-24.04-arm'
+    base-image: "ubuntu:24.04"
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
+  - build-type: 'cublas'
+    cuda-major-version: "12"
+    cuda-minor-version: "0"
+    platforms: 'linux/arm64'
+    skip-drivers: 'false'
+    tag-latest: 'auto'
+    tag-suffix: '-nvidia-l4t-arm64-moss-transcribe-cpp'
+    base-image: "nvcr.io/nvidia/l4t-jetpack:r36.4.0"
+    runs-on: 'ubuntu-24.04-arm'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2204'
+  - build-type: 'hipblas'
+    cuda-major-version: ""
+    cuda-minor-version: ""
+    platforms: 'linux/amd64'
+    tag-latest: 'auto'
+    tag-suffix: '-gpu-rocm-hipblas-moss-transcribe-cpp'
+    base-image: "rocm/dev-ubuntu-24.04:7.2.1"
+    runs-on: 'ubuntu-latest'
+    skip-drivers: 'false'
+    backend: "moss-transcribe-cpp"
+    dockerfile: "./backend/Dockerfile.golang"
+    context: "./"
+    ubuntu-version: '2404'
  # ced
  - build-type: 'cublas'
    cuda-major-version: "12"
@@ -5220,6 +5368,10 @@ includeDarwin:
    tag-suffix: "-metal-darwin-arm64-parakeet-cpp"
    build-type: "metal"
    lang: "go"
+  - backend: "moss-transcribe-cpp"
+    tag-suffix: "-metal-darwin-arm64-moss-transcribe-cpp"
+    build-type: "metal"
+    lang: "go"
  - backend: "ced"
    tag-suffix: "-metal-darwin-arm64-ced"
    build-type: "metal"
--- a/.github/workflows/bump_deps.yaml
+++ b/.github/workflows/bump_deps.yaml
@@ -42,6 +42,10 @@ jobs:
            variable: "PARAKEET_VERSION"
            branch: "master"
            file: "backend/go/parakeet-cpp/Makefile"
+          - repository: "mudler/moss-transcribe.cpp"
+            variable: "MOSS_VERSION"
+            branch: "master"
+            file: "backend/go/moss-transcribe-cpp/Makefile"
          - repository: "mudler/ced.cpp"
            variable: "CED_VERSION"
            branch: "master"
--- a/18
+++ b/18
@@ -1,5 +1,5 @@
 # Disable parallel execution for backend builds
-.NOTPARALLEL: backends/diffusers backends/llama-cpp backends/turboquant backends/outetts backends/piper backends/stablediffusion-ggml backends/whisper backends/crispasr backends/parakeet-cpp backends/faster-whisper backends/silero-vad backends/local-store backends/huggingface backends/rfdetr backends/rfdetr-cpp backends/insightface backends/speaker-recognition backends/kitten-tts backends/kokoro backends/chatterbox backends/llama-cpp-darwin backends/neutts build-darwin-python-backend build-darwin-go-backend backends/mlx backends/diffuser-darwin backends/mlx-vlm backends/mlx-audio backends/mlx-distributed backends/stablediffusion-ggml-darwin backends/vllm backends/vllm-omni backends/sglang backends/moonshine backends/pocket-tts backends/qwen-tts backends/faster-qwen3-tts backends/qwen-asr backends/nemo backends/voxcpm backends/whisperx backends/ace-step backends/acestep-cpp backends/fish-speech backends/voxtral backends/opus backends/trl backends/llama-cpp-quantization backends/kokoros backends/sam3-cpp backends/qwen3-tts-cpp backends/omnivoice-cpp backends/vibevoice-cpp backends/localvqe backends/tinygrad backends/sherpa-onnx backends/ds4 backends/ds4-darwin backends/liquid-audio backends/supertonic backends/depth-anything-cpp backends/privacy-filter backends/privacy-filter-darwin
+.NOTPARALLEL: backends/diffusers backends/llama-cpp backends/turboquant backends/outetts backends/piper backends/stablediffusion-ggml backends/whisper backends/crispasr backends/parakeet-cpp backends/moss-transcribe-cpp backends/faster-whisper backends/silero-vad backends/local-store backends/huggingface backends/rfdetr backends/rfdetr-cpp backends/insightface backends/speaker-recognition backends/kitten-tts backends/kokoro backends/chatterbox backends/llama-cpp-darwin backends/neutts build-darwin-python-backend build-darwin-go-backend backends/mlx backends/diffuser-darwin backends/mlx-vlm backends/mlx-audio backends/mlx-distributed backends/stablediffusion-ggml-darwin backends/vllm backends/vllm-omni backends/sglang backends/moonshine backends/pocket-tts backends/qwen-tts backends/faster-qwen3-tts backends/qwen-asr backends/nemo backends/voxcpm backends/whisperx backends/ace-step backends/acestep-cpp backends/fish-speech backends/voxtral backends/opus backends/trl backends/llama-cpp-quantization backends/kokoros backends/sam3-cpp backends/qwen3-tts-cpp backends/omnivoice-cpp backends/vibevoice-cpp backends/localvqe backends/tinygrad backends/sherpa-onnx backends/ds4 backends/ds4-darwin backends/liquid-audio backends/supertonic backends/depth-anything-cpp backends/privacy-filter backends/privacy-filter-darwin

 GOCMD=go
 GOTEST=$(GOCMD) test
@@ -1044,6 +1044,18 @@ test-extra-backend-parakeet-cpp-transcription: docker-build-parakeet-cpp
 	BACKEND_TEST_CAPS=health,load,transcription \
 	$(MAKE) test-extra-backend

+## Audio transcription wrapper for the moss-transcribe-cpp (moss-transcribe.cpp
+## ggml port) backend. Mirrors test-extra-backend-parakeet-cpp-transcription:
+## drives the AudioTranscription RPC against a published MOSS GGUF using the JFK
+## 11s clip from whisper.cpp's CI samples. Not part of the default test suite -
+## run explicitly once the pinned model URL is reachable.
+test-extra-backend-moss-transcribe-cpp-transcription: docker-build-moss-transcribe-cpp
+	BACKEND_IMAGE=local-ai-backend:moss-transcribe-cpp \
+	BACKEND_TEST_MODEL_URL=https://huggingface.co/mudler/moss-transcribe.cpp-gguf/resolve/main/moss-transcribe-q5_k.gguf \
+	BACKEND_TEST_AUDIO_URL=https://github.com/ggml-org/whisper.cpp/raw/master/samples/jfk.wav \
+	BACKEND_TEST_CAPS=health,load,transcription \
+	$(MAKE) test-extra-backend
+
 ## LocalVQE audio transform (joint AEC + noise suppression + dereverb).
 ## Exercises the audio_transform capability end-to-end: batch transform
 ## of a real WAV fixture and bidi streaming of synthetic silent frames.
@@ -1212,6 +1224,7 @@ BACKEND_STABLEDIFFUSION_GGML = stablediffusion-ggml|golang|.|--progress=plain|tr
 BACKEND_WHISPER = whisper|golang|.|false|true
 BACKEND_CRISPASR = crispasr|golang|.|false|true
 BACKEND_PARAKEET_CPP = parakeet-cpp|golang|.|false|true
+BACKEND_MOSS_TRANSCRIBE_CPP = moss-transcribe-cpp|golang|.|false|true
 BACKEND_DEPTH_ANYTHING_CPP = depth-anything-cpp|golang|.|false|true
 BACKEND_VOXTRAL = voxtral|golang|.|false|true
 BACKEND_ACESTEP_CPP = acestep-cpp|golang|.|false|true
@@ -1305,6 +1318,7 @@ $(eval $(call generate-docker-build-target,$(BACKEND_STABLEDIFFUSION_GGML)))
 $(eval $(call generate-docker-build-target,$(BACKEND_WHISPER)))
 $(eval $(call generate-docker-build-target,$(BACKEND_CRISPASR)))
 $(eval $(call generate-docker-build-target,$(BACKEND_PARAKEET_CPP)))
+$(eval $(call generate-docker-build-target,$(BACKEND_MOSS_TRANSCRIBE_CPP)))
 $(eval $(call generate-docker-build-target,$(BACKEND_DEPTH_ANYTHING_CPP)))
 $(eval $(call generate-docker-build-target,$(BACKEND_VOXTRAL)))
 $(eval $(call generate-docker-build-target,$(BACKEND_OPUS)))
@@ -1357,7 +1371,7 @@ $(eval $(call generate-docker-build-target,$(BACKEND_SUPERTONIC)))
 docker-save-%: backend-images
 	docker save local-ai-backend:$* -o backend-images/$*.tar

-docker-build-backends: docker-build-llama-cpp docker-build-ik-llama-cpp docker-build-turboquant docker-build-ds4 docker-build-rerankers docker-build-vllm docker-build-vllm-omni docker-build-sglang docker-build-transformers docker-build-outetts docker-build-diffusers docker-build-kokoro docker-build-faster-whisper docker-build-crispasr docker-build-coqui docker-build-chatterbox docker-build-vibevoice docker-build-liquid-audio docker-build-moonshine docker-build-pocket-tts docker-build-qwen-tts docker-build-fish-speech docker-build-faster-qwen3-tts docker-build-qwen-asr docker-build-nemo docker-build-voxcpm docker-build-whisperx docker-build-ace-step docker-build-acestep-cpp docker-build-voxtral docker-build-mlx-distributed docker-build-trl docker-build-llama-cpp-quantization docker-build-tinygrad docker-build-kokoros docker-build-sam3-cpp docker-build-rfdetr-cpp docker-build-qwen3-tts-cpp docker-build-omnivoice-cpp docker-build-vibevoice-cpp docker-build-localvqe docker-build-insightface docker-build-speaker-recognition docker-build-sherpa-onnx docker-build-cloud-proxy docker-build-supertonic docker-build-depth-anything-cpp docker-build-privacy-filter
+docker-build-backends: docker-build-llama-cpp docker-build-ik-llama-cpp docker-build-turboquant docker-build-ds4 docker-build-rerankers docker-build-vllm docker-build-vllm-omni docker-build-sglang docker-build-transformers docker-build-outetts docker-build-diffusers docker-build-kokoro docker-build-faster-whisper docker-build-crispasr docker-build-coqui docker-build-chatterbox docker-build-vibevoice docker-build-liquid-audio docker-build-moonshine docker-build-pocket-tts docker-build-qwen-tts docker-build-fish-speech docker-build-faster-qwen3-tts docker-build-qwen-asr docker-build-nemo docker-build-voxcpm docker-build-whisperx docker-build-ace-step docker-build-acestep-cpp docker-build-voxtral docker-build-mlx-distributed docker-build-trl docker-build-llama-cpp-quantization docker-build-tinygrad docker-build-kokoros docker-build-sam3-cpp docker-build-rfdetr-cpp docker-build-qwen3-tts-cpp docker-build-omnivoice-cpp docker-build-vibevoice-cpp docker-build-localvqe docker-build-insightface docker-build-speaker-recognition docker-build-sherpa-onnx docker-build-cloud-proxy docker-build-supertonic docker-build-depth-anything-cpp docker-build-moss-transcribe-cpp docker-build-privacy-filter

 ########################################################
 ### Mock Backend for E2E Tests
--- a/README.md
+++ b/README.md
@@ -232,6 +232,7 @@ Most backends wrap a best-in-class upstream engine. A handful of them are native
 | Backend | What it does |
 |---------|-------------|
 | [parakeet.cpp](https://github.com/mudler/parakeet.cpp) | C++/GGML port of NVIDIA NeMo Parakeet ASR (tdt/ctc/rnnt/hybrid), with cache-aware streaming transcription |
+| [moss-transcribe.cpp](https://github.com/mudler/moss-transcribe.cpp) | C++/GGML port of OpenMOSS MOSS-Transcribe-Diarize: joint long-form transcription, speaker diarization and timestamping in a single pass |
 | [ced.cpp](https://github.com/mudler/ced.cpp) | C++/GGML port of the CED audio-tagging models: sound-event classification (527-class AudioSet) over REST and the realtime API for live recognition |
 | [voice-detect.cpp](https://github.com/mudler/voice-detect.cpp) | Speaker recognition and voice analysis (ECAPA-TDNN, WeSpeaker, ERes2Net, CAM++, wav2vec2 age/gender/emotion), replacing the Python speaker-recognition backend |
 | [voxtral.c](https://github.com/mudler/voxtral.c) | Voxtral Realtime 4B speech-to-text in pure C |
--- a/backend/go/moss-transcribe-cpp/.gitignore
+++ b/backend/go/moss-transcribe-cpp/.gitignore
@@ -0,0 +1,12 @@
+.cache/
+sources/
+build/
+package/
+moss-transcribe-cpp-grpc
+# build artifacts staged in-tree by the Makefile (cp from sources/) or
+# symlinked for local dev; the real sources live in moss-transcribe.cpp upstream.
+*.so
+*.so.*
+*.dylib
+moss_transcribe_capi.h
+compile_commands.json
--- a/backend/go/moss-transcribe-cpp/Makefile
+++ b/backend/go/moss-transcribe-cpp/Makefile
@@ -0,0 +1,98 @@
+# moss-transcribe-cpp backend Makefile.
+#
+# Upstream pin lives below as MOSS_VERSION?=1fbe88c8ebf0134ed2c49b49345102752500fbe5
+# (.github/bump_deps.sh) can find and update it - matches the
+# whisper.cpp / parakeet-cpp / ds4 convention.
+#
+# Local dev shortcut: if you already have an out-of-tree moss-transcribe.cpp
+# build, you can symlink the .so + header into this directory and skip the
+# clone/cmake steps entirely, e.g.:
+#
+#   ln -sf /path/to/moss-transcribe.cpp/build-shared/libmoss-transcribe.so .
+#   ln -sf /path/to/moss-transcribe.cpp/include/moss_transcribe_capi.h .
+#   go build -o moss-transcribe-cpp-grpc .
+#
+# That's what the L0 smoke test uses. The default target below does the proper
+# clone-at-pin + cmake build so CI doesn't need a side-checkout.
+
+MOSS_VERSION?=1fbe88c8ebf0134ed2c49b49345102752500fbe5
+MOSS_REPO?=https://github.com/mudler/moss-transcribe.cpp
+
+GOCMD?=go
+GO_TAGS?=
+JOBS?=$(shell nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)
+
+BUILD_TYPE?=
+NATIVE?=false
+
+# Build ggml statically into libmoss-transcribe.so (PIC) so the shared lib is
+# self-contained: dlopen needs no libggml*.so alongside it, only system libs
+# (libstdc++/libgomp/libc) that the runtime image already provides. MT_SHARED
+# flips ggml to a static PIC build (see the moss-transcribe.cpp CMakeLists).
+CMAKE_ARGS?=-DCMAKE_BUILD_TYPE=Release -DMT_SHARED=ON -DMT_BUILD_CLI=OFF -DBUILD_SHARED_LIBS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON
+
+ifeq ($(NATIVE),false)
+	CMAKE_ARGS+=-DGGML_NATIVE=OFF
+endif
+
+# moss-transcribe.cpp gates its GGML backends behind MT_GGML_* options and does
+# set(GGML_<be> ${MT_GGML_<be>} CACHE BOOL "" FORCE), so a bare -DGGML_CUDA=ON is
+# overwritten back to OFF and the build silently falls back to CPU. Forward the
+# MT_GGML_* options instead (openblas is not gated, so -DGGML_BLAS passes through).
+ifeq ($(BUILD_TYPE),cublas)
+	CMAKE_ARGS+=-DMT_GGML_CUDA=ON -DGGML_CUDA_GRAPHS=ON
+else ifeq ($(BUILD_TYPE),openblas)
+	CMAKE_ARGS+=-DGGML_BLAS=ON -DGGML_BLAS_VENDOR=OpenBLAS
+else ifeq ($(BUILD_TYPE),hipblas)
+	CMAKE_ARGS+=-DMT_GGML_HIP=ON
+else ifeq ($(BUILD_TYPE),vulkan)
+	CMAKE_ARGS+=-DMT_GGML_VULKAN=ON
+else ifeq ($(BUILD_TYPE),metal)
+	CMAKE_ARGS+=-DMT_GGML_METAL=ON
+endif
+
+.PHONY: moss-transcribe-cpp-grpc package build clean purge test all
+
+all: moss-transcribe-cpp-grpc
+
+# Clone the upstream moss-transcribe.cpp source at the pinned commit. Directory
+# acts as the target so make only re-clones when missing. After a MOSS_VERSION
+# bump, run 'make purge && make' to refetch.
+sources/moss-transcribe.cpp:
+	mkdir -p sources/moss-transcribe.cpp
+	cd sources/moss-transcribe.cpp && \
+	git init -q && \
+	git remote add origin $(MOSS_REPO) && \
+	git fetch --depth 1 origin $(MOSS_VERSION) && \
+	git checkout FETCH_HEAD && \
+	git submodule update --init --recursive --depth 1 --single-branch
+
+# Build the shared lib + header out-of-tree, then stage them next to the Go
+# sources so purego.Dlopen("libmoss-transcribe.so") and the cgo-less build both
+# pick them up.
+libmoss-transcribe.so: sources/moss-transcribe.cpp
+	cmake -B sources/moss-transcribe.cpp/build-shared -S sources/moss-transcribe.cpp $(CMAKE_ARGS)
+	cmake --build sources/moss-transcribe.cpp/build-shared --config Release -j$(JOBS)
+	cp -fv sources/moss-transcribe.cpp/build-shared/libmoss-transcribe.so* ./ 2>/dev/null || true
+	cp -fv sources/moss-transcribe.cpp/build-shared/libmoss-transcribe.dylib ./ 2>/dev/null || true
+	cp -fv sources/moss-transcribe.cpp/include/moss_transcribe_capi.h ./
+
+moss-transcribe-cpp-grpc: libmoss-transcribe.so main.go gomosstranscribecpp.go segments.go
+	CGO_ENABLED=0 $(GOCMD) build -tags "$(GO_TAGS)" -o moss-transcribe-cpp-grpc .
+
+package: moss-transcribe-cpp-grpc
+	bash package.sh
+
+build: package
+
+# Test target. The model-backed smoke test is gated on
+# MOSS_BACKEND_TEST_MODEL + MOSS_BACKEND_TEST_WAV; without them that spec
+# auto-skips, leaving the pure-Go parser/unit tests.
+test:
+	LD_LIBRARY_PATH=$(CURDIR):$$LD_LIBRARY_PATH $(GOCMD) test ./... -count=1
+
+clean: purge
+	rm -rf libmoss-transcribe.so* moss_transcribe_capi.h package moss-transcribe-cpp-grpc
+
+purge:
+	rm -rf sources/moss-transcribe.cpp
--- a/backend/go/moss-transcribe-cpp/gomosstranscribecpp.go
+++ b/backend/go/moss-transcribe-cpp/gomosstranscribecpp.go
@@ -0,0 +1,179 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"unsafe"
+
+	"github.com/mudler/LocalAI/pkg/grpc/base"
+	"github.com/mudler/LocalAI/pkg/grpc/grpcerrors"
+	pb "github.com/mudler/LocalAI/pkg/grpc/proto"
+	"github.com/mudler/LocalAI/pkg/utils"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// purego-bound entry points from libmoss-transcribe.so. Names match
+// moss_transcribe_capi.h exactly so a `nm libmoss-transcribe.so | grep
+// moss_transcribe_capi` is enough to spot drift.
+//
+// The transcribe_* functions return char* declared here as uintptr so we can
+// call moss_transcribe_capi_free_string on the same pointer after copying: the
+// C-API contract is "caller owns and must free the returned buffer".
+var (
+	CppAbiVersion     func() int32
+	CppLoad           func(ggufPath string) uintptr
+	CppFree           func(ctx uintptr)
+	CppTranscribePath func(ctx uintptr, wavPath string, maxNew int32) uintptr
+	CppTranscribePcm  func(ctx uintptr, samples []float32, nSamples int32, sampleRate int32, maxNew int32) uintptr
+	CppFreeString     func(s uintptr)
+	CppLastError      func(ctx uintptr) string
+)
+
+// MossTranscribeCpp owns a single loaded moss_transcribe_ctx. MOSS is an
+// offline transcription + diarization + timestamping engine: one model, one
+// context, no streaming. The C engine holds a single mutable context and is
+// not reentrant, so we embed base.SingleThread — LocalAI serialises every RPC
+// through the server-level lock, and only one transcription touches the engine
+// at a time.
+type MossTranscribeCpp struct {
+	base.SingleThread
+	ctxPtr uintptr
+	maxNew int32
+}
+
+// Load is the LocalAI gRPC entry point for LoadModel: it calls
+// moss_transcribe_capi_load with the GGUF path and stashes the resulting
+// opaque context pointer for AudioTranscription.
+func (m *MossTranscribeCpp) Load(opts *pb.ModelOptions) error {
+	if opts.ModelFile == "" {
+		return errors.New("moss-transcribe-cpp: ModelFile is required")
+	}
+
+	// max_new_tokens caps the generated tokens per transcription; <=0 uses the
+	// GGUF's default_max_new_tokens (the C-API's own default). Exposed as a
+	// model YAML option: (key:value form, like the sibling ggml backends).
+	m.maxNew = int32(optInt(opts, "max_new_tokens", 0))
+
+	ctx := CppLoad(opts.ModelFile)
+	if ctx == 0 {
+		// No ctx to ask for last_error (the C-API's last-error buffer lives on
+		// the ctx that was never returned). Surface the path so the operator at
+		// least knows which load failed.
+		return fmt.Errorf("moss-transcribe-cpp: moss_transcribe_capi_load failed for %q", opts.ModelFile)
+	}
+	m.ctxPtr = ctx
+	return nil
+}
+
+// optInt reads an integer model option (key:value form) from ModelOptions,
+// returning def when absent or unparseable. The options array carries the
+// model YAML's options: entries (see core/config; siblings such as parakeet-cpp
+// parse the same key:value form via strings.Cut on ":").
+func optInt(opts *pb.ModelOptions, key string, def int) int {
+	for _, o := range opts.GetOptions() {
+		k, v, ok := strings.Cut(o, ":")
+		if ok && strings.TrimSpace(k) == key {
+			if n, err := strconv.Atoi(strings.TrimSpace(v)); err == nil {
+				return n
+			}
+		}
+	}
+	return def
+}
+
+// AudioTranscription converts the audio at opts.Dst to a 16 kHz mono WAV and
+// hands the path to moss_transcribe_capi_transcribe_path. The model emits its
+// own speaker-labelled, time-aligned transcript in the compact
+// "[start][Sxx]text[end]..." format (seconds); we parse it into LocalAI
+// TranscriptSegments carrying int64-nanosecond timestamps and the per-segment
+// speaker label.
+//
+// MOSS does joint transcription + diarization + timestamps in one pass, so
+// translate/language/prompt/temperature/threads are not applicable and are
+// ignored. Streaming is not supported (offline model).
+func (m *MossTranscribeCpp) AudioTranscription(ctx context.Context, opts *pb.TranscriptRequest) (pb.TranscriptResult, error) {
+	if m.ctxPtr == 0 {
+		return pb.TranscriptResult{}, grpcerrors.ModelNotLoaded("moss-transcribe-cpp")
+	}
+	if opts.Dst == "" {
+		return pb.TranscriptResult{}, errors.New("moss-transcribe-cpp: TranscriptRequest.dst (audio path) is required")
+	}
+	if err := ctx.Err(); err != nil {
+		return pb.TranscriptResult{}, status.Error(codes.Canceled, "transcription cancelled")
+	}
+
+	// The C loader understands WAV; convert any input (MP3, etc.) to 16 kHz
+	// mono WAV first - the same normalisation every other audio backend
+	// (whisper, parakeet-cpp) does via utils.AudioToWav before handing the file
+	// to the engine.
+	converted, cleanup, err := convertToWavMono16k(opts.Dst)
+	if err != nil {
+		return pb.TranscriptResult{}, err
+	}
+	defer cleanup()
+
+	cstr := CppTranscribePath(m.ctxPtr, converted, m.maxNew)
+	if cstr == 0 {
+		return pb.TranscriptResult{}, fmt.Errorf("moss-transcribe-cpp: transcribe_path failed: %s", CppLastError(m.ctxPtr))
+	}
+	raw := goStringFromCPtr(cstr)
+	CppFreeString(cstr)
+
+	return transcriptResultFromRaw(raw), nil
+}
+
+// Free releases the underlying moss_transcribe_ctx. Called by LocalAI when the
+// model is unloaded.
+func (m *MossTranscribeCpp) Free() error {
+	if m.ctxPtr != 0 {
+		CppFree(m.ctxPtr)
+		m.ctxPtr = 0
+	}
+	return nil
+}
+
+// convertToWavMono16k converts an arbitrary audio file to a 16 kHz mono WAV in
+// a fresh temp dir and returns the path together with a cleanup func the caller
+// must defer. WAV inputs already at 16 kHz/mono/16-bit are passed through by
+// utils.AudioToWav (hardlink/copy), everything else is transcoded via ffmpeg.
+func convertToWavMono16k(path string) (string, func(), error) {
+	dir, err := os.MkdirTemp("", "moss-transcribe")
+	if err != nil {
+		return "", func() {}, err
+	}
+	cleanup := func() { _ = os.RemoveAll(dir) }
+
+	converted := filepath.Join(dir, "converted.wav")
+	if err := utils.AudioToWav(path, converted); err != nil {
+		cleanup()
+		return "", func() {}, err
+	}
+	return converted, cleanup, nil
+}
+
+// goStringFromCPtr copies a NUL-terminated C string into Go memory. cptr is the
+// raw pointer returned by purego from the C-API (a malloc'd buffer the caller
+// owns); callers must free it via CppFreeString after the copy lands.
+//
+// The uintptr->unsafe.Pointer conversion below trips go vet's unsafeptr check,
+// which can't distinguish a C-owned heap pointer from Go-managed memory. It is
+// safe here: the pointer addresses a malloc'd C buffer the Go GC neither tracks
+// nor moves, and we dereference it immediately to copy the bytes out (the same
+// pattern the whisper / parakeet-cpp backends use).
+func goStringFromCPtr(cptr uintptr) string {
+	if cptr == 0 {
+		return ""
+	}
+	p := unsafe.Pointer(cptr) //nolint:govet // C-owned malloc'd buffer, not Go-GC memory (see doc above)
+	n := 0
+	for *(*byte)(unsafe.Add(p, n)) != 0 {
+		n++
+	}
+	return string(unsafe.Slice((*byte)(p), n))
+}
--- a/backend/go/moss-transcribe-cpp/gomosstranscribecpp_test.go
+++ b/backend/go/moss-transcribe-cpp/gomosstranscribecpp_test.go
@@ -0,0 +1,164 @@
+package main
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/ebitengine/purego"
+	"github.com/go-audio/audio"
+	"github.com/go-audio/wav"
+	pb "github.com/mudler/LocalAI/pkg/grpc/proto"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+func TestMossTranscribeCpp(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "moss-transcribe-cpp Backend Suite")
+}
+
+var (
+	libLoadOnce sync.Once
+	libLoadErr  error
+)
+
+// ensureLibLoaded mirrors main.go's bootstrap so a Go test can drive the C-API
+// bridge without spinning up the gRPC server. Skips the current spec when
+// libmoss-transcribe.so isn't loadable from cwd ($LD_LIBRARY_PATH or a symlink
+// in ./).
+func ensureLibLoaded() {
+	libLoadOnce.Do(func() {
+		libName := os.Getenv("MOSS_TRANSCRIBE_LIBRARY")
+		if libName == "" {
+			libName = "libmoss-transcribe.so"
+		}
+		lib, err := purego.Dlopen(libName, purego.RTLD_NOW|purego.RTLD_GLOBAL)
+		if err != nil {
+			libLoadErr = err
+			return
+		}
+		purego.RegisterLibFunc(&CppAbiVersion, lib, "moss_transcribe_capi_abi_version")
+		purego.RegisterLibFunc(&CppLoad, lib, "moss_transcribe_capi_load")
+		purego.RegisterLibFunc(&CppFree, lib, "moss_transcribe_capi_free")
+		purego.RegisterLibFunc(&CppTranscribePath, lib, "moss_transcribe_capi_transcribe_path")
+		purego.RegisterLibFunc(&CppTranscribePcm, lib, "moss_transcribe_capi_transcribe_pcm")
+		purego.RegisterLibFunc(&CppFreeString, lib, "moss_transcribe_capi_free_string")
+		purego.RegisterLibFunc(&CppLastError, lib, "moss_transcribe_capi_last_error")
+	})
+	if libLoadErr != nil {
+		Skip("libmoss-transcribe.so not loadable: " + libLoadErr.Error())
+	}
+}
+
+// fixturesOrSkip returns the model + audio paths or skips the spec if either
+// env var is unset. The smoke test never runs in default CI; it needs a real
+// MOSS GGUF and a WAV on disk.
+func fixturesOrSkip() (string, string) {
+	modelPath := os.Getenv("MOSS_BACKEND_TEST_MODEL")
+	audioPath := os.Getenv("MOSS_BACKEND_TEST_WAV")
+	if modelPath == "" || audioPath == "" {
+		Skip("set MOSS_BACKEND_TEST_MODEL and MOSS_BACKEND_TEST_WAV to run this spec")
+	}
+	return modelPath, audioPath
+}
+
+// writeMono16kWav writes `samples` frames of 16 kHz mono 16-bit silence to
+// path. The result is already in AudioToWav's target format, so the conversion
+// helper copies it through without invoking ffmpeg.
+func writeMono16kWav(path string, samples int) {
+	GinkgoHelper()
+	f, err := os.Create(path)
+	Expect(err).ToNot(HaveOccurred())
+	enc := wav.NewEncoder(f, 16000, 16, 1, 1)
+	buf := &audio.IntBuffer{
+		Format:         &audio.Format{NumChannels: 1, SampleRate: 16000},
+		SourceBitDepth: 16,
+		Data:           make([]int, samples),
+	}
+	Expect(enc.Write(buf)).To(Succeed())
+	Expect(enc.Close()).To(Succeed())
+	Expect(f.Close()).To(Succeed())
+}
+
+var _ = Describe("MossTranscribeCpp", func() {
+	Context("ABI / load smoke (needs libmoss-transcribe.so)", func() {
+		It("reports a positive ABI version", func() {
+			ensureLibLoaded()
+			Expect(CppAbiVersion()).To(BeNumerically(">=", 1))
+		})
+
+		It("transcribes a WAV into speaker-labelled segments", func() {
+			modelPath, audioPath := fixturesOrSkip()
+			ensureLibLoaded()
+
+			m := &MossTranscribeCpp{}
+			Expect(m.Load(&pb.ModelOptions{ModelFile: modelPath})).To(Succeed())
+			defer func() { _ = m.Free() }()
+
+			res, err := m.AudioTranscription(context.Background(), &pb.TranscriptRequest{
+				Dst: audioPath,
+			})
+			Expect(err).ToNot(HaveOccurred())
+			Expect(strings.TrimSpace(res.Text)).ToNot(BeEmpty(),
+				"expected non-empty transcript for %s", audioPath)
+			Expect(res.Segments).ToNot(BeEmpty(), "expected at least one segment")
+			var prevEnd int64
+			for i, seg := range res.Segments {
+				Expect(strings.TrimSpace(seg.Text)).ToNot(BeEmpty(),
+					"segment %d must have text", i)
+				Expect(seg.End).To(BeNumerically(">=", seg.Start),
+					"segment %d end must not precede its start", i)
+				Expect(seg.Start).To(BeNumerically(">=", prevEnd),
+					"segments must be in time order")
+				prevEnd = seg.End
+			}
+		})
+	})
+
+	Context("Load validation", func() {
+		It("rejects an empty ModelFile", func() {
+			m := &MossTranscribeCpp{}
+			Expect(m.Load(&pb.ModelOptions{})).To(HaveOccurred())
+		})
+	})
+
+	Context("AudioTranscription guards (no C library required)", func() {
+		It("returns ModelNotLoaded when no context is loaded", func() {
+			m := &MossTranscribeCpp{}
+			_, err := m.AudioTranscription(context.Background(), &pb.TranscriptRequest{Dst: "x.wav"})
+			Expect(err).To(HaveOccurred())
+		})
+
+		It("errors when the audio path is empty", func() {
+			m := &MossTranscribeCpp{ctxPtr: 1}
+			_, err := m.AudioTranscription(context.Background(), &pb.TranscriptRequest{})
+			Expect(err).To(HaveOccurred())
+		})
+	})
+
+	Context("convertToWavMono16k", func() {
+		It("returns a decodable 16kHz mono WAV copy and cleans it up", func() {
+			dir := GinkgoT().TempDir()
+			src := filepath.Join(dir, "input.wav")
+			writeMono16kWav(src, 16000) // 1s of silence at 16 kHz
+
+			converted, cleanup, err := convertToWavMono16k(src)
+			Expect(err).ToNot(HaveOccurred())
+
+			Expect(converted).ToNot(Equal(src))
+			Expect(converted).To(BeAnExistingFile())
+
+			cleanup()
+			Expect(converted).ToNot(BeAnExistingFile(), "cleanup removes the temp dir")
+		})
+
+		It("errors on a non-existent input rather than passing the path through", func() {
+			_, _, err := convertToWavMono16k(filepath.Join(GinkgoT().TempDir(), "missing.mp3"))
+			Expect(err).To(HaveOccurred())
+		})
+	})
+})
--- a/backend/go/moss-transcribe-cpp/main.go
+++ b/backend/go/moss-transcribe-cpp/main.go
@@ -0,0 +1,70 @@
+package main
+
+// Started internally by LocalAI - one gRPC server per loaded model.
+//
+// Loads the moss-transcribe shared library via purego and registers the flat
+// C-API entry points declared in moss_transcribe_capi.h. The library name can
+// be overridden with MOSS_TRANSCRIBE_LIBRARY (mirrors the WHISPER_LIBRARY /
+// PARAKEET_LIBRARY convention in the sibling backends); the default looks next
+// to this binary for libmoss-transcribe.so on Linux and
+// libmoss-transcribe.dylib on macOS.
+import (
+	"flag"
+	"fmt"
+	"os"
+	"runtime"
+
+	"github.com/ebitengine/purego"
+	grpc "github.com/mudler/LocalAI/pkg/grpc"
+)
+
+var (
+	addr = flag.String("addr", "localhost:50051", "the address to connect to")
+)
+
+type LibFuncs struct {
+	FuncPtr any
+	Name    string
+}
+
+func main() {
+	libName := os.Getenv("MOSS_TRANSCRIBE_LIBRARY")
+	if libName == "" {
+		if runtime.GOOS == "darwin" {
+			libName = "libmoss-transcribe.dylib"
+		} else {
+			libName = "libmoss-transcribe.so"
+		}
+	}
+
+	lib, err := purego.Dlopen(libName, purego.RTLD_NOW|purego.RTLD_GLOBAL)
+	if err != nil {
+		panic(fmt.Errorf("moss-transcribe-cpp: dlopen %q: %w", libName, err))
+	}
+
+	// Bound 1:1 to moss_transcribe_capi.h. The transcribe_* entry points return
+	// a malloc'd char* the caller owns; we register those as uintptr so we get
+	// the raw pointer back and can call moss_transcribe_capi_free_string on it
+	// (purego's string return would copy and forget the original pointer,
+	// leaking it on every call).
+	libFuncs := []LibFuncs{
+		{&CppAbiVersion, "moss_transcribe_capi_abi_version"},
+		{&CppLoad, "moss_transcribe_capi_load"},
+		{&CppFree, "moss_transcribe_capi_free"},
+		{&CppTranscribePath, "moss_transcribe_capi_transcribe_path"},
+		{&CppTranscribePcm, "moss_transcribe_capi_transcribe_pcm"},
+		{&CppFreeString, "moss_transcribe_capi_free_string"},
+		{&CppLastError, "moss_transcribe_capi_last_error"},
+	}
+	for _, lf := range libFuncs {
+		purego.RegisterLibFunc(lf.FuncPtr, lib, lf.Name)
+	}
+
+	fmt.Fprintf(os.Stderr, "[moss-transcribe-cpp] ABI=%d\n", CppAbiVersion())
+
+	flag.Parse()
+
+	if err := grpc.StartServer(*addr, &MossTranscribeCpp{}); err != nil {
+		panic(err)
+	}
+}
--- a/backend/go/moss-transcribe-cpp/package.sh
+++ b/backend/go/moss-transcribe-cpp/package.sh
@@ -0,0 +1,71 @@
+#!/bin/bash
+#
+# Bundle the moss-transcribe-cpp-grpc binary, libmoss-transcribe.so, the core
+# runtime libs (libc/libstdc++/libgomp + ld.so) and the GPU runtime for the
+# active BUILD_TYPE so the package is self-contained. Mirrors
+# backend/go/parakeet-cpp/package.sh; run.sh routes the (CGO_ENABLED=0) binary
+# through lib/ld.so so the packaged libc is used instead of the host's.
+
+set -e
+
+CURDIR=$(dirname "$(realpath "$0")")
+REPO_ROOT="${CURDIR}/../../.."
+
+mkdir -p "$CURDIR/package/lib"
+
+cp -avf "$CURDIR/moss-transcribe-cpp-grpc" "$CURDIR/package/"
+cp -avf "$CURDIR/run.sh" "$CURDIR/package/"
+
+# libmoss-transcribe shared lib + any soname symlinks. On Linux this is
+# libmoss-transcribe.so[.X.Y]; on macOS it is libmoss-transcribe.dylib.
+# purego.Dlopen resolves it via the *_LIBRARY_PATH that run.sh points at lib/.
+cp -avf "$CURDIR"/libmoss-transcribe.so* "$CURDIR/package/lib/" 2>/dev/null || true
+cp -avf "$CURDIR"/libmoss-transcribe.dylib "$CURDIR/package/lib/" 2>/dev/null || true
+if ! ls "$CURDIR"/package/lib/libmoss-transcribe.* >/dev/null 2>&1; then
+	echo "ERROR: libmoss-transcribe shared library not found in $CURDIR, run 'make' first" >&2
+	exit 1
+fi
+
+# Detect architecture and copy the core runtime libs libmoss-transcribe.so links
+# against, plus the matching dynamic loader as lib/ld.so.
+if [ -f "/lib64/ld-linux-x86-64.so.2" ]; then
+    echo "Detected x86_64 architecture, copying x86_64 libraries..."
+    cp -arfLv /lib64/ld-linux-x86-64.so.2 "$CURDIR/package/lib/ld.so"
+    cp -arfLv /lib/x86_64-linux-gnu/libc.so.6 "$CURDIR/package/lib/libc.so.6"
+    cp -arfLv /lib/x86_64-linux-gnu/libgcc_s.so.1 "$CURDIR/package/lib/libgcc_s.so.1"
+    cp -arfLv /lib/x86_64-linux-gnu/libstdc++.so.6 "$CURDIR/package/lib/libstdc++.so.6"
+    cp -arfLv /lib/x86_64-linux-gnu/libm.so.6 "$CURDIR/package/lib/libm.so.6"
+    cp -arfLv /lib/x86_64-linux-gnu/libgomp.so.1 "$CURDIR/package/lib/libgomp.so.1"
+    cp -arfLv /lib/x86_64-linux-gnu/libdl.so.2 "$CURDIR/package/lib/libdl.so.2"
+    cp -arfLv /lib/x86_64-linux-gnu/librt.so.1 "$CURDIR/package/lib/librt.so.1"
+    cp -arfLv /lib/x86_64-linux-gnu/libpthread.so.0 "$CURDIR/package/lib/libpthread.so.0"
+elif [ -f "/lib/ld-linux-aarch64.so.1" ]; then
+    echo "Detected ARM64 architecture, copying ARM64 libraries..."
+    cp -arfLv /lib/ld-linux-aarch64.so.1 "$CURDIR/package/lib/ld.so"
+    cp -arfLv /lib/aarch64-linux-gnu/libc.so.6 "$CURDIR/package/lib/libc.so.6"
+    cp -arfLv /lib/aarch64-linux-gnu/libgcc_s.so.1 "$CURDIR/package/lib/libgcc_s.so.1"
+    cp -arfLv /lib/aarch64-linux-gnu/libstdc++.so.6 "$CURDIR/package/lib/libstdc++.so.6"
+    cp -arfLv /lib/aarch64-linux-gnu/libm.so.6 "$CURDIR/package/lib/libm.so.6"
+    cp -arfLv /lib/aarch64-linux-gnu/libgomp.so.1 "$CURDIR/package/lib/libgomp.so.1"
+    cp -arfLv /lib/aarch64-linux-gnu/libdl.so.2 "$CURDIR/package/lib/libdl.so.2"
+    cp -arfLv /lib/aarch64-linux-gnu/librt.so.1 "$CURDIR/package/lib/librt.so.1"
+    cp -arfLv /lib/aarch64-linux-gnu/libpthread.so.0 "$CURDIR/package/lib/libpthread.so.0"
+elif [ "$(uname -s)" = "Darwin" ]; then
+    echo "Detected Darwin — system frameworks linked dynamically, no bundled libs needed"
+else
+    echo "Error: Could not detect architecture"
+    exit 1
+fi
+
+# Package GPU libraries (CUDA/ROCm/Intel/Vulkan loader + ICDs + drivers) based
+# on BUILD_TYPE so the backend can reach the GPU without the runtime base image
+# shipping those drivers.
+GPU_LIB_SCRIPT="${REPO_ROOT}/scripts/build/package-gpu-libs.sh"
+if [ -f "$GPU_LIB_SCRIPT" ]; then
+    echo "Packaging GPU libraries for BUILD_TYPE=${BUILD_TYPE:-cpu}..."
+    source "$GPU_LIB_SCRIPT" "$CURDIR/package/lib"
+    package_gpu_libs
+fi
+
+echo "Packaging completed successfully"
+ls -liah "$CURDIR/package/" "$CURDIR/package/lib/"
--- a/backend/go/moss-transcribe-cpp/run.sh
+++ b/backend/go/moss-transcribe-cpp/run.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+set -e
+
+CURDIR=$(dirname "$(realpath "$0")")
+
+if [ "$(uname)" = "Darwin" ]; then
+	export DYLD_LIBRARY_PATH="$CURDIR/lib:"$CURDIR":${DYLD_LIBRARY_PATH:-}"
+	export MOSS_TRANSCRIBE_LIBRARY="$CURDIR/lib/libmoss-transcribe.dylib"
+else
+	export LD_LIBRARY_PATH="$CURDIR/lib:"$CURDIR":${LD_LIBRARY_PATH:-}"
+	export MOSS_TRANSCRIBE_LIBRARY="$CURDIR/lib/libmoss-transcribe.so"
+fi
+
+# If a self-contained ld.so was packaged, route through it so the packaged libc
+# / libstdc++ are used instead of the host's (matches the whisper / parakeet-cpp
+# backends' runtime layout). Linux only.
+if [ -f "$CURDIR/lib/ld.so" ]; then
+	echo "Using lib/ld.so"
+	exec "$CURDIR/lib/ld.so" "$CURDIR/moss-transcribe-cpp-grpc" "$@"
+fi
+
+exec "$CURDIR/moss-transcribe-cpp-grpc" "$@"
--- a/backend/go/moss-transcribe-cpp/segments.go
+++ b/backend/go/moss-transcribe-cpp/segments.go
@@ -0,0 +1,156 @@
+package main
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+
+	pb "github.com/mudler/LocalAI/pkg/grpc/proto"
+)
+
+// mossSegment is one parsed unit of the MOSS transcript: a speaker-labelled
+// span with fractional-second start/end times, straight from the model's own
+// output. Timestamps stay in seconds here; secondsToNanos converts them at the
+// TranscriptSegment boundary.
+type mossSegment struct {
+	Start   float64
+	End     float64
+	Speaker string
+	Text    string
+}
+
+// bracketRe matches one "[...]" token (timestamp or speaker tag). The MOSS
+// transcript is a concatenation of "[start][Sxx]text[end]" segments, e.g.
+//
+//	[0.28][S01] And so, my fellow Americans,[7.71][8.12][S02] ask ...[10.59]
+//
+// so the bracketed tokens carry all the structure and the free text lives
+// between a speaker tag and the following (end) timestamp.
+var bracketRe = regexp.MustCompile(`\[([^\]]*)\]`)
+
+// speakerRe matches a speaker tag: an 'S' (any case) followed by one or more
+// digits, e.g. "S01", "S12". Anything else in brackets that isn't a speaker tag
+// is treated as a timestamp candidate.
+var speakerRe = regexp.MustCompile(`^[Ss][0-9]+$`)
+
+// bracketToken is a "[...]" token plus the free text that follows it up to the
+// next token (or end of string). For a speaker tag that trailing text is the
+// segment's transcript.
+type bracketToken struct {
+	content   string
+	textAfter string
+}
+
+// parseTranscript parses the compact "[start][Sxx]text[end]..." MOSS transcript
+// into structured segments. It walks the bracket tokens looking for a
+// start-timestamp, a speaker tag, and an end-timestamp, taking the text that
+// follows the speaker tag as the segment transcript. Tokens that don't fit the
+// grammar are skipped rather than aborting the parse, so a slightly malformed
+// stream still yields the segments it can.
+func parseTranscript(raw string) []mossSegment {
+	locs := bracketRe.FindAllStringSubmatchIndex(raw, -1)
+	toks := make([]bracketToken, len(locs))
+	for i, m := range locs {
+		// m[2]:m[3] is the capture group (the content inside the brackets);
+		// m[1] is the byte just past the closing ']'.
+		nextStart := len(raw)
+		if i+1 < len(locs) {
+			nextStart = locs[i+1][0]
+		}
+		toks[i] = bracketToken{
+			content:   raw[m[2]:m[3]],
+			textAfter: raw[m[1]:nextStart],
+		}
+	}
+
+	var segs []mossSegment
+	i := 0
+	for i < len(toks) {
+		start, ok := parseTimestamp(toks[i].content)
+		if !ok {
+			i++
+			continue
+		}
+		// A start timestamp must be followed by a speaker tag; otherwise this
+		// isn't a segment head, so skip it.
+		if i+1 >= len(toks) || !isSpeakerTag(toks[i+1].content) {
+			i++
+			continue
+		}
+		speaker := strings.ToUpper(strings.TrimSpace(toks[i+1].content))
+		text := strings.TrimSpace(toks[i+1].textAfter)
+
+		// The end timestamp is the next token if present and numeric; a segment
+		// that runs to the end of the stream without a closing timestamp falls
+		// back to start==end.
+		end := start
+		consumed := 2
+		if i+2 < len(toks) {
+			if e, ok := parseTimestamp(toks[i+2].content); ok {
+				end = e
+				consumed = 3
+			}
+		}
+
+		segs = append(segs, mossSegment{Start: start, End: end, Speaker: speaker, Text: text})
+		i += consumed
+	}
+	return segs
+}
+
+// isSpeakerTag reports whether the bracket content is a MOSS speaker tag ("Sxx").
+func isSpeakerTag(content string) bool {
+	return speakerRe.MatchString(strings.TrimSpace(content))
+}
+
+// parseTimestamp parses a bracket content as a fractional-second timestamp. A
+// speaker tag ("S01") never parses as a float, so this cleanly distinguishes
+// the two token kinds.
+func parseTimestamp(content string) (float64, bool) {
+	f, err := strconv.ParseFloat(strings.TrimSpace(content), 64)
+	if err != nil {
+		return 0, false
+	}
+	return f, true
+}
+
+// secondsToNanos converts the transcript's fractional-second timestamps into
+// the int64 nanoseconds LocalAI carries on TranscriptSegment, the same
+// nanosecond convention the whisper / parakeet-cpp backends use.
+func secondsToNanos(sec float64) int64 {
+	return int64(sec * 1e9)
+}
+
+// transcriptResultFromRaw parses the raw MOSS transcript and shapes it into a
+// TranscriptResult. Each parsed segment becomes a TranscriptSegment with
+// nanosecond start/end and the model's own speaker label; Text is the segments
+// joined with single spaces. When nothing parses (no bracket structure) it
+// falls back to a single whole-clip text segment so callers always get a
+// transcript.
+func transcriptResultFromRaw(raw string) pb.TranscriptResult {
+	segs := parseTranscript(raw)
+	if len(segs) == 0 {
+		text := strings.TrimSpace(raw)
+		return pb.TranscriptResult{
+			Text:     text,
+			Segments: []*pb.TranscriptSegment{{Id: 0, Text: text}},
+		}
+	}
+
+	var full strings.Builder
+	pbSegs := make([]*pb.TranscriptSegment, 0, len(segs))
+	for id, s := range segs {
+		if id > 0 && s.Text != "" {
+			full.WriteString(" ")
+		}
+		full.WriteString(s.Text)
+		pbSegs = append(pbSegs, &pb.TranscriptSegment{
+			Id:      int32(id),
+			Start:   secondsToNanos(s.Start),
+			End:     secondsToNanos(s.End),
+			Text:    s.Text,
+			Speaker: s.Speaker,
+		})
+	}
+	return pb.TranscriptResult{Text: strings.TrimSpace(full.String()), Segments: pbSegs}
+}
--- a/backend/go/moss-transcribe-cpp/segments_test.go
+++ b/backend/go/moss-transcribe-cpp/segments_test.go
@@ -0,0 +1,104 @@
+package main
+
+import (
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("parseTranscript ([start][Sxx]text[end] grammar)", func() {
+	It("parses the README two-speaker example into ordered segments", func() {
+		raw := "[0.28][S01] And so, my fellow Americans, ask not what your country can do for you,[7.71][8.12][S02] ask what you can do for your country.[10.59]"
+		segs := parseTranscript(raw)
+		Expect(segs).To(HaveLen(2))
+
+		Expect(segs[0].Speaker).To(Equal("S01"))
+		Expect(segs[0].Start).To(BeNumerically("~", 0.28, 1e-9))
+		Expect(segs[0].End).To(BeNumerically("~", 7.71, 1e-9))
+		Expect(segs[0].Text).To(Equal("And so, my fellow Americans, ask not what your country can do for you,"))
+
+		Expect(segs[1].Speaker).To(Equal("S02"))
+		Expect(segs[1].Start).To(BeNumerically("~", 8.12, 1e-9))
+		Expect(segs[1].End).To(BeNumerically("~", 10.59, 1e-9))
+		Expect(segs[1].Text).To(Equal("ask what you can do for your country."))
+	})
+
+	It("parses a single segment", func() {
+		segs := parseTranscript("[1.50][S01] hello world[3.25]")
+		Expect(segs).To(HaveLen(1))
+		Expect(segs[0].Start).To(BeNumerically("~", 1.50, 1e-9))
+		Expect(segs[0].End).To(BeNumerically("~", 3.25, 1e-9))
+		Expect(segs[0].Speaker).To(Equal("S01"))
+		Expect(segs[0].Text).To(Equal("hello world"))
+	})
+
+	It("uppercases a lowercase speaker tag", func() {
+		segs := parseTranscript("[0.00][s03] hi[0.90]")
+		Expect(segs).To(HaveLen(1))
+		Expect(segs[0].Speaker).To(Equal("S03"))
+	})
+
+	It("falls back to start==end when the closing timestamp is missing", func() {
+		segs := parseTranscript("[2.00][S01] trailing words with no end")
+		Expect(segs).To(HaveLen(1))
+		Expect(segs[0].Start).To(BeNumerically("~", 2.00, 1e-9))
+		Expect(segs[0].End).To(Equal(segs[0].Start))
+		Expect(segs[0].Text).To(Equal("trailing words with no end"))
+	})
+
+	It("handles multi-digit speaker ids and higher speaker counts", func() {
+		segs := parseTranscript("[0.0][S01] a[1.0][1.0][S12] b[2.0]")
+		Expect(segs).To(HaveLen(2))
+		Expect(segs[0].Speaker).To(Equal("S01"))
+		Expect(segs[1].Speaker).To(Equal("S12"))
+	})
+
+	It("returns no segments for text without bracket structure", func() {
+		Expect(parseTranscript("just some plain text")).To(BeEmpty())
+		Expect(parseTranscript("")).To(BeEmpty())
+	})
+
+	It("skips a start timestamp not followed by a speaker tag", func() {
+		// A stray timestamp pair without a speaker tag is not a segment head.
+		segs := parseTranscript("[1.0][2.0][S01] real[3.0]")
+		Expect(segs).To(HaveLen(1))
+		Expect(segs[0].Speaker).To(Equal("S01"))
+		Expect(segs[0].Text).To(Equal("real"))
+	})
+})
+
+var _ = Describe("transcriptResultFromRaw", func() {
+	It("shapes parsed segments into a TranscriptResult with nanosecond times and speakers", func() {
+		raw := "[0.28][S01] first part,[7.71][8.12][S02] second part.[10.59]"
+		res := transcriptResultFromRaw(raw)
+
+		Expect(res.Segments).To(HaveLen(2))
+		Expect(res.Segments[0].Id).To(Equal(int32(0)))
+		Expect(res.Segments[0].Start).To(Equal(secondsToNanos(0.28)))
+		Expect(res.Segments[0].End).To(Equal(secondsToNanos(7.71)))
+		Expect(res.Segments[0].Speaker).To(Equal("S01"))
+		Expect(res.Segments[0].Text).To(Equal("first part,"))
+
+		Expect(res.Segments[1].Id).To(Equal(int32(1)))
+		Expect(res.Segments[1].Speaker).To(Equal("S02"))
+		Expect(res.Segments[1].Start).To(Equal(secondsToNanos(8.12)))
+
+		// Full text is the segments joined with single spaces.
+		Expect(res.Text).To(Equal("first part, second part."))
+	})
+
+	It("falls back to a single whole-clip text segment when nothing parses", func() {
+		res := transcriptResultFromRaw("plain transcript with no markers")
+		Expect(res.Segments).To(HaveLen(1))
+		Expect(res.Segments[0].Text).To(Equal("plain transcript with no markers"))
+		Expect(res.Segments[0].Start).To(Equal(int64(0)))
+		Expect(res.Text).To(Equal("plain transcript with no markers"))
+	})
+})
+
+var _ = Describe("secondsToNanos", func() {
+	It("converts fractional seconds to int64 nanoseconds", func() {
+		Expect(secondsToNanos(0)).To(Equal(int64(0)))
+		Expect(secondsToNanos(1)).To(Equal(int64(1e9)))
+		Expect(secondsToNanos(0.28)).To(Equal(int64(0.28 * 1e9)))
+	})
+})
--- a/backend/index.yaml
+++ b/backend/index.yaml
@@ -178,6 +178,35 @@
    nvidia-cuda-12: "cuda12-parakeet-cpp"
    nvidia-l4t-cuda-12: "nvidia-l4t-arm64-parakeet-cpp"
    nvidia-l4t-cuda-13: "cuda13-nvidia-l4t-arm64-parakeet-cpp"
+- &mosstranscribecpp
+  name: "moss-transcribe-cpp"
+  alias: "moss-transcribe-cpp"
+  license: mit
+  icon: https://avatars.githubusercontent.com/u/95302084
+  description: |
+    moss-transcribe.cpp is a C++/ggml port of OpenMOSS MOSS-Transcribe-Diarize, an end-to-end audio understanding model.
+    It does joint long-form transcription, speaker diarization and timestamping in a single pass, emitting a speaker-labelled,
+    time-aligned transcript, and runs on CPU, NVIDIA CUDA, AMD ROCm/HIP, Intel SYCL, Vulkan, Apple Metal and NVIDIA Jetson (L4T) targets.
+  urls:
+    - https://github.com/mudler/moss-transcribe.cpp
+  tags:
+    - audio-transcription
+    - CPU
+    - GPU
+    - CUDA
+    - HIP
+  capabilities:
+    default: "cpu-moss-transcribe-cpp"
+    nvidia: "cuda12-moss-transcribe-cpp"
+    intel: "intel-sycl-f16-moss-transcribe-cpp"
+    metal: "metal-moss-transcribe-cpp"
+    amd: "rocm-moss-transcribe-cpp"
+    vulkan: "vulkan-moss-transcribe-cpp"
+    nvidia-l4t: "nvidia-l4t-arm64-moss-transcribe-cpp"
+    nvidia-cuda-13: "cuda13-moss-transcribe-cpp"
+    nvidia-cuda-12: "cuda12-moss-transcribe-cpp"
+    nvidia-l4t-cuda-12: "nvidia-l4t-arm64-moss-transcribe-cpp"
+    nvidia-l4t-cuda-13: "cuda13-nvidia-l4t-arm64-moss-transcribe-cpp"
 - &ced
  name: "ced"
  alias: "ced"
@@ -2784,6 +2813,121 @@
  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-nvidia-cuda-13-parakeet-cpp"
  mirrors:
    - localai/localai-backends:master-gpu-nvidia-cuda-13-parakeet-cpp
+## moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "moss-transcribe-cpp-development"
+  capabilities:
+    default: "cpu-moss-transcribe-cpp-development"
+    nvidia: "cuda12-moss-transcribe-cpp-development"
+    intel: "intel-sycl-f16-moss-transcribe-cpp-development"
+    metal: "metal-moss-transcribe-cpp-development"
+    amd: "rocm-moss-transcribe-cpp-development"
+    vulkan: "vulkan-moss-transcribe-cpp-development"
+    nvidia-l4t: "nvidia-l4t-arm64-moss-transcribe-cpp-development"
+    nvidia-cuda-13: "cuda13-moss-transcribe-cpp-development"
+    nvidia-cuda-12: "cuda12-moss-transcribe-cpp-development"
+    nvidia-l4t-cuda-12: "nvidia-l4t-arm64-moss-transcribe-cpp-development"
+    nvidia-l4t-cuda-13: "cuda13-nvidia-l4t-arm64-moss-transcribe-cpp-development"
+- !!merge <<: *mosstranscribecpp
+  name: "nvidia-l4t-arm64-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-nvidia-l4t-arm64-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-nvidia-l4t-arm64-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "nvidia-l4t-arm64-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-nvidia-l4t-arm64-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-nvidia-l4t-arm64-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cuda13-nvidia-l4t-arm64-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-nvidia-l4t-cuda-13-arm64-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-nvidia-l4t-cuda-13-arm64-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cuda13-nvidia-l4t-arm64-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-nvidia-l4t-cuda-13-arm64-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-nvidia-l4t-cuda-13-arm64-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cpu-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-cpu-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-cpu-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cpu-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-cpu-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-cpu-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "metal-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-metal-darwin-arm64-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-metal-darwin-arm64-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "metal-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-metal-darwin-arm64-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-metal-darwin-arm64-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cuda12-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-gpu-nvidia-cuda-12-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-gpu-nvidia-cuda-12-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cuda12-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-nvidia-cuda-12-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-gpu-nvidia-cuda-12-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "rocm-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-gpu-rocm-hipblas-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-gpu-rocm-hipblas-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "rocm-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-rocm-hipblas-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-gpu-rocm-hipblas-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "intel-sycl-f32-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-gpu-intel-sycl-f32-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-gpu-intel-sycl-f32-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "intel-sycl-f32-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-intel-sycl-f32-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-gpu-intel-sycl-f32-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "intel-sycl-f16-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-gpu-intel-sycl-f16-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-gpu-intel-sycl-f16-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "intel-sycl-f16-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-intel-sycl-f16-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-gpu-intel-sycl-f16-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "vulkan-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-gpu-vulkan-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-gpu-vulkan-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "vulkan-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-vulkan-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-gpu-vulkan-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cuda13-moss-transcribe-cpp"
+  uri: "quay.io/go-skynet/local-ai-backends:latest-gpu-nvidia-cuda-13-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:latest-gpu-nvidia-cuda-13-moss-transcribe-cpp
+- !!merge <<: *mosstranscribecpp
+  name: "cuda13-moss-transcribe-cpp-development"
+  uri: "quay.io/go-skynet/local-ai-backends:master-gpu-nvidia-cuda-13-moss-transcribe-cpp"
+  mirrors:
+    - localai/localai-backends:master-gpu-nvidia-cuda-13-moss-transcribe-cpp
 ## ced
 - !!merge <<: *ced
  name: "ced-development"
--- a/core/gallery/importers/importers.go
+++ b/core/gallery/importers/importers.go
@@ -119,6 +119,10 @@ var defaultImporters = []Importer{
 	// kept ahead of LlamaCPPImporter so its .gguf bundles aren't claimed by the
 	// generic GGUF importer.
 	&ParakeetCppImporter{},
+	// MossTranscribeCppImporter matches only moss-transcribe GGUFs
+	// (moss-transcribe[-<quant>].gguf); like parakeet-cpp it stays ahead of
+	// LlamaCPPImporter so its .gguf bundles aren't claimed by the generic GGUF importer.
+	&MossTranscribeCppImporter{},
 	// TTS (Batch 2)
 	&PiperImporter{},
 	&BarkImporter{},
--- a/core/gallery/importers/moss-transcribe-cpp.go
+++ b/core/gallery/importers/moss-transcribe-cpp.go
@@ -0,0 +1,178 @@
+package importers
+
+import (
+	"encoding/json"
+	"path/filepath"
+	"strings"
+
+	"github.com/mudler/LocalAI/core/config"
+	"github.com/mudler/LocalAI/core/gallery"
+	"github.com/mudler/LocalAI/core/schema"
+	"github.com/mudler/LocalAI/pkg/downloader"
+	hfapi "github.com/mudler/LocalAI/pkg/huggingface-api"
+	"go.yaml.in/yaml/v2"
+)
+
+var _ Importer = &MossTranscribeCppImporter{}
+
+// MossTranscribeCppImporter recognises moss-transcribe.cpp GGUF weights, the
+// C++/ggml port of OpenMOSS MOSS-Transcribe-Diarize. The signal is narrow on
+// purpose: moss-transcribe.cpp names its weights "moss-transcribe[-<quant>].gguf"
+// (e.g. moss-transcribe-q5_k.gguf, moss-transcribe-q8_0.gguf), so we only match a
+// .gguf whose name carries the "moss-transcribe" token. That keeps us from
+// claiming arbitrary llama-style GGUFs (the importer is registered before
+// llama-cpp). preferences.backend="moss-transcribe-cpp" forces the importer
+// regardless.
+type MossTranscribeCppImporter struct{}
+
+func (i *MossTranscribeCppImporter) Name() string      { return "moss-transcribe-cpp" }
+func (i *MossTranscribeCppImporter) Modality() string  { return "asr" }
+func (i *MossTranscribeCppImporter) AutoDetects() bool { return true }
+
+func (i *MossTranscribeCppImporter) Match(details Details) bool {
+	preferences, err := details.Preferences.MarshalJSON()
+	if err != nil {
+		return false
+	}
+	preferencesMap := make(map[string]any)
+	if len(preferences) > 0 {
+		if err := json.Unmarshal(preferences, &preferencesMap); err != nil {
+			return false
+		}
+	}
+
+	if b, ok := preferencesMap["backend"].(string); ok && b == "moss-transcribe-cpp" {
+		return true
+	}
+
+	// Direct URL or path to a moss-transcribe GGUF.
+	if isMossTranscribeGGUF(filepath.Base(details.URI)) {
+		return true
+	}
+
+	// HF repo shipping at least one moss-transcribe GGUF.
+	if details.HuggingFace != nil {
+		for _, f := range details.HuggingFace.Files {
+			if isMossTranscribeGGUF(filepath.Base(f.Path)) {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
+func (i *MossTranscribeCppImporter) Import(details Details) (gallery.ModelConfig, error) {
+	preferences, err := details.Preferences.MarshalJSON()
+	if err != nil {
+		return gallery.ModelConfig{}, err
+	}
+	preferencesMap := make(map[string]any)
+	if len(preferences) > 0 {
+		if err := json.Unmarshal(preferences, &preferencesMap); err != nil {
+			return gallery.ModelConfig{}, err
+		}
+	}
+
+	name, ok := preferencesMap["name"].(string)
+	if !ok {
+		name = filepath.Base(details.URI)
+	}
+
+	description, ok := preferencesMap["description"].(string)
+	if !ok {
+		description = "Imported from " + details.URI
+	}
+
+	// MOSS quants are byte-exact against the reference even at Q5_K (and ~1/6 the
+	// size), so default to q5_k, then fall back up the size ladder; the last file
+	// wins if none match (mirrors parakeet-cpp / whisper).
+	preferredQuants, _ := preferencesMap["quantizations"].(string)
+	quants := []string{"q5_k", "q4_k", "q6_k", "q8_0", "f16"}
+	if preferredQuants != "" {
+		quants = strings.Split(preferredQuants, ",")
+	}
+
+	cfg := gallery.ModelConfig{
+		Name:        name,
+		Description: description,
+	}
+
+	modelConfig := config.ModelConfig{
+		Name:                name,
+		Description:         description,
+		Backend:             "moss-transcribe-cpp",
+		KnownUsecaseStrings: []string{"transcript"},
+	}
+
+	uri := downloader.URI(details.URI)
+	directGGUF := isMossTranscribeGGUF(filepath.Base(details.URI))
+	switch {
+	case uri.LooksLikeURL() && directGGUF:
+		// Direct file URL (e.g. .../resolve/main/moss-transcribe-q5_k.gguf). The
+		// exact file is known, no quant pick.
+		fileName, err := uri.FilenameFromUrl()
+		if err != nil {
+			return gallery.ModelConfig{}, err
+		}
+		target := filepath.Join("moss-transcribe-cpp", "models", name, fileName)
+		cfg.Files = append(cfg.Files, gallery.File{
+			URI:      details.URI,
+			Filename: target,
+		})
+		modelConfig.PredictionOptions = schema.PredictionOptions{
+			BasicModelRequest: schema.BasicModelRequest{Model: target},
+		}
+	case details.HuggingFace != nil:
+		// HF repo: collect every moss-transcribe GGUF, pick the preferred quant,
+		// and nest under moss-transcribe-cpp/models/<name>/ so a multi-quant repo
+		// doesn't collide on disk.
+		var ggufFiles []hfapi.ModelFile
+		for _, f := range details.HuggingFace.Files {
+			if isMossTranscribeGGUF(filepath.Base(f.Path)) {
+				ggufFiles = append(ggufFiles, f)
+			}
+		}
+		if chosen, ok := pickPreferredGGMLFile(ggufFiles, quants); ok {
+			target := filepath.Join("moss-transcribe-cpp", "models", name, filepath.Base(chosen.Path))
+			cfg.Files = append(cfg.Files, gallery.File{
+				URI:      chosen.URL,
+				Filename: target,
+				SHA256:   chosen.SHA256,
+			})
+			modelConfig.PredictionOptions = schema.PredictionOptions{
+				BasicModelRequest: schema.BasicModelRequest{Model: target},
+			}
+		}
+	default:
+		// Bare URI with no HF metadata (pref-only path): point at the basename so
+		// users can tweak the YAML after import.
+		modelConfig.PredictionOptions = schema.PredictionOptions{
+			BasicModelRequest: schema.BasicModelRequest{Model: filepath.Base(details.URI)},
+		}
+	}
+
+	data, err := yaml.Marshal(modelConfig)
+	if err != nil {
+		return gallery.ModelConfig{}, err
+	}
+	cfg.ConfigFile = string(data)
+
+	return cfg, nil
+}
+
+// isMossTranscribeGGUF reports whether name is a moss-transcribe.cpp GGUF: a
+// .gguf file whose name carries the "moss-transcribe" token (hyphen or
+// underscore form). The .gguf check is case-insensitive.
+func isMossTranscribeGGUF(name string) bool {
+	lower := strings.ToLower(name)
+	if !strings.HasSuffix(lower, ".gguf") {
+		return false
+	}
+	for _, tok := range []string{"moss-transcribe", "moss_transcribe"} {
+		if strings.Contains(lower, tok) {
+			return true
+		}
+	}
+	return false
+}
--- a/core/gallery/importers/moss-transcribe-cpp_test.go
+++ b/core/gallery/importers/moss-transcribe-cpp_test.go
@@ -0,0 +1,96 @@
+package importers_test
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/mudler/LocalAI/core/gallery/importers"
+	hfapi "github.com/mudler/LocalAI/pkg/huggingface-api"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+// mossDetails builds Details carrying a synthetic HF file list so detection can
+// be exercised without hitting the network.
+func mossDetails(uri string, prefs string, files ...hfapi.ModelFile) importers.Details {
+	return importers.Details{
+		URI:         uri,
+		Preferences: json.RawMessage(prefs),
+		HuggingFace: &hfapi.ModelDetails{Files: files},
+	}
+}
+
+var _ = Describe("MossTranscribeCppImporter", func() {
+	imp := &importers.MossTranscribeCppImporter{}
+
+	Context("Importer interface metadata", func() {
+		It("exposes name/modality/autodetect", func() {
+			Expect(imp.Name()).To(Equal("moss-transcribe-cpp"))
+			Expect(imp.Modality()).To(Equal("asr"))
+			Expect(imp.AutoDetects()).To(BeTrue())
+		})
+	})
+
+	Context("detection (Match)", func() {
+		It("matches an HF repo shipping a moss-transcribe GGUF", func() {
+			d := mossDetails("huggingface://mudler/moss-transcribe.cpp-gguf", `{}`,
+				hfapi.ModelFile{Path: "moss-transcribe-q5_k.gguf"},
+				hfapi.ModelFile{Path: "README.md"},
+			)
+			Expect(imp.Match(d)).To(BeTrue())
+		})
+
+		It("matches a direct URL to a moss-transcribe GGUF", func() {
+			d := mossDetails("https://huggingface.co/mudler/moss-transcribe.cpp-gguf/resolve/main/moss-transcribe-q8_0.gguf", `{}`)
+			Expect(imp.Match(d)).To(BeTrue())
+		})
+
+		It("honours preferences.backend=moss-transcribe-cpp for arbitrary URIs", func() {
+			d := mossDetails("https://example.com/whatever", `{"backend": "moss-transcribe-cpp"}`)
+			Expect(imp.Match(d)).To(BeTrue())
+		})
+
+		It("does NOT claim a generic llama-style GGUF", func() {
+			d := mossDetails("huggingface://someorg/some-llm-gguf", `{}`,
+				hfapi.ModelFile{Path: "llama-3-8b-instruct-q4_k_m.gguf"},
+			)
+			Expect(imp.Match(d)).To(BeFalse())
+		})
+	})
+
+	Context("import (Import)", func() {
+		It("picks the default quant (q5_k) from a multi-quant HF repo", func() {
+			d := mossDetails("huggingface://mudler/moss-transcribe.cpp-gguf", `{"name":"moss-transcribe"}`,
+				hfapi.ModelFile{Path: "moss-transcribe-f16.gguf", URL: "https://hf/f16", SHA256: "aaa"},
+				hfapi.ModelFile{Path: "moss-transcribe-q5_k.gguf", URL: "https://hf/q5k", SHA256: "bbb"},
+				hfapi.ModelFile{Path: "moss-transcribe-q8_0.gguf", URL: "https://hf/q8", SHA256: "ccc"},
+			)
+			cfg, err := imp.Import(d)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(cfg.ConfigFile).To(ContainSubstring("backend: moss-transcribe-cpp"), fmt.Sprintf("%+v", cfg))
+			Expect(cfg.ConfigFile).To(ContainSubstring("transcript"))
+			Expect(cfg.Files).To(HaveLen(1))
+			Expect(cfg.Files[0].URI).To(Equal("https://hf/q5k"), "default quant should be q5_k")
+			Expect(cfg.Files[0].Filename).To(ContainSubstring("moss-transcribe-cpp/models/moss-transcribe/moss-transcribe-q5_k.gguf"))
+		})
+
+		It("honours a preferred quantization override", func() {
+			d := mossDetails("huggingface://mudler/moss-transcribe.cpp-gguf", `{"name":"m","quantizations":"q8_0"}`,
+				hfapi.ModelFile{Path: "moss-transcribe-q5_k.gguf", URL: "https://hf/q5k"},
+				hfapi.ModelFile{Path: "moss-transcribe-q8_0.gguf", URL: "https://hf/q8"},
+			)
+			cfg, err := imp.Import(d)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(cfg.Files).To(HaveLen(1))
+			Expect(cfg.Files[0].URI).To(Equal("https://hf/q8"))
+		})
+
+		It("uses the exact file for a direct GGUF URL", func() {
+			d := mossDetails("https://huggingface.co/mudler/moss-transcribe.cpp-gguf/resolve/main/moss-transcribe-q5_k.gguf", `{"name":"moss"}`)
+			cfg, err := imp.Import(d)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(cfg.Files).To(HaveLen(1))
+			Expect(cfg.Files[0].Filename).To(ContainSubstring("moss-transcribe-cpp/models/moss/moss-transcribe-q5_k.gguf"))
+		})
+	})
+})
--- a/docs/content/features/backends.md
+++ b/docs/content/features/backends.md
@@ -125,7 +125,7 @@ For getting started, see the available backends in LocalAI here: https://github.
 LocalAI supports various types of backends:

 - **LLM Backends**: For running language models (e.g., llama.cpp, vLLM, SGLang, transformers, MLX)
- **Speech-to-Text Backends**: For transcription (e.g., whisper.cpp, parakeet.cpp, faster-whisper, NeMo)
+- **Speech-to-Text Backends**: For transcription and speaker diarization (e.g., whisper.cpp, parakeet.cpp, moss-transcribe.cpp, faster-whisper, NeMo)
 - **Text-to-Speech Backends**: For speech synthesis (e.g., piper, Kokoro, VibeVoice, Qwen3-TTS)
 - **Sound Generation Backends**: For music and audio generation (e.g., ACE-Step)
 - **Sound Classification Backends**: For sound-event classification / audio tagging - identifying everyday sounds like baby cry, glass breaking, alarms (e.g., ced.cpp)
--- a/gallery/index.yaml
+++ b/gallery/index.yaml
@@ -36199,6 +36199,37 @@
    - filename: parakeet-cpp/nemotron-3.5-asr-streaming-0.6b-q8_0.gguf
      uri: huggingface://mudler/parakeet-cpp-gguf/nemotron-3.5-asr-streaming-0.6b-q8_0.gguf
      sha256: ba2f13eccd4a5245be728f77e6149bd6a4fdcdd133ff2e08ac6005bcef7a99f1
+- name: moss-transcribe-cpp-0.9b
+  url: github:mudler/LocalAI/gallery/virtual.yaml@master
+  urls:
+    - https://huggingface.co/mudler/moss-transcribe.cpp-gguf
+    - https://github.com/mudler/moss-transcribe.cpp
+  description: |
+    MOSS-Transcribe-Diarize 0.9B, an end-to-end audio understanding model for joint multi-speaker transcription,
+    speaker diarization and timestamping in a single pass. Q5_K GGUF for the moss-transcribe-cpp backend (C++/ggml
+    port of OpenMOSS MOSS-Transcribe-Diarize), byte-identical to the reference at ~1/6 the size. Faster than the
+    reference PyTorch runtime on CPU (1.6 to 2.2x).
+  license: apache-2.0
+  tags:
+    - moss
+    - moss-transcribe-cpp
+    - asr
+    - diarization
+    - speech-recognition
+    - stt
+    - gguf
+    - ggml
+  overrides:
+    backend: moss-transcribe-cpp
+    known_usecases:
+      - transcript
+    name: moss-transcribe-cpp-0.9b
+    parameters:
+      model: moss-transcribe-cpp/moss-transcribe-q5_k.gguf
+  files:
+    - filename: moss-transcribe-cpp/moss-transcribe-q5_k.gguf
+      uri: huggingface://mudler/moss-transcribe.cpp-gguf/moss-transcribe-q5_k.gguf
+      sha256: 6fe985fd9a9cd043728f7be49659d10de6901872dad73b49e3c30e1340582e79
 - name: parakeet-crispasr
  url: github:mudler/LocalAI/gallery/virtual.yaml@master
  urls:
--- a/scripts/changed-backends.js
+++ b/scripts/changed-backends.js
@@ -33,6 +33,14 @@ function inferBackendPath(item) {
  if (item.backend === "ced") {
    return `backend/go/ced/`;
  }
+  // moss-transcribe-cpp is a Go backend (Dockerfile.golang) wrapping the
+  // moss-transcribe.cpp ggml port via purego, living in
+  // backend/go/moss-transcribe-cpp/. Same explicit-branch rationale as
+  // parakeet-cpp / ced: the generic golang fallthrough would also resolve it,
+  // but this documents the mapping and guards a future dockerfile-suffix change.
+  if (item.backend === "moss-transcribe-cpp") {
+    return `backend/go/moss-transcribe-cpp/`;
+  }
  if (item.dockerfile.endsWith("golang")) {
    return `backend/go/${item.backend}/`;
  }