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Claude Code Cache Hit Rates Slumped Before Rebounding in v2.1.90 and v2.1.91

ArkNill’s proxy monitoring said cache-related client bugs pushed prompt cache hit rates down to 4%-17%, increasing usage costs by 10-20x before later versions restored performance.

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Terms & Concepts
  • Prompt cache: A system that reuses previously processed prompt data to reduce repeated computation, lower latency, and cut model usage costs.
  • Proxy monitoring: A method of observing application traffic through an intermediary service to measure behavior such as cache performance and request patterns.
  • Client bug: A software flaw on the user-side application that can disrupt expected behavior, including caching and API request handling.