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## Motivation For using Exo-Bench extensively, there are many cases that we could use prefix caching to speed up the benchmarks, especially when the focus is on the token generation. At the same time, it's very clear that prefix caching decode tokens is not very useful in most current scenarios. Surprisingly, even for non-thinking models, the chat template means that a continued conversation will be formatted such that the existing cache is not effective. We already (slightly accidentally) do this for the batch generator - we should do it for the sequential generator too. ## Changes We can now speed up exo bench by having a use prefix caching flag. Of course, for most accurate pp results, it is better to not have it, but this speeds up tg and large benchmarking significantly. Updated methodology to match ## Test Plan ### Manual Testing Tested on many configurations that the difference in results is negligible, even with multiple --pp options.