Semantic Caching Test: Rewriting Bad Cache Hits Is Worse Than Missing
Reasonable_Royal_621 · reddit · 2026-08-21
The author tested a 'rewrite instead of reject' strategy (similar to TweakLLM) in semantic caching, where a small model corrects imperfect cache hits. Results show an error rate of 22%-61% across three benchmarks, significantly higher than the zero-error cost of simply regenerating. Additionally, rewrite calls take 2.7-6 seconds, potentially exceeding regeneration time, and bad cache hits often lead to hallucinations or safety risks (e.g., grafting irrelevant answers onto sensitive queries).
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