Suffix Cache Reuse: fixing KV cache for agents that edit context in place
RulinShao · x · 2026-10-02
Rulin Shao and the CLM team published a deep dive into efficient serving for Context Language Models. Existing engines like SGLang and vLLM reuse only the longest matching KV prefix, assuming append-only context—mid-context edits force recomputing unchanged suffix tokens. Suffix Cache Reuse (SCR) prefills only the replaced segment, reuses the earlier cache as prefix, and relocates unchanged suffix caches. They also propose Prefix-Reuse FLOPs to measure realistic cache-aware serving cost, arguing AI systems should be designed for AI, and hinting at giving CLMs direct agency over the cache.
Related event: Meta Open-Sources Suffix Cache Reuse to Boost Agent Inference Efficiency(4 posts)→
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