Prompt Cache Readout: Read the Exact-Prefix Signal

Sera is reading a prompt-caching dashboard for a repeated QA workflow. Use the values to diagnose the architecture. Prompt caching signals to inspect Automatic caching threshold Prompts at or above the documented minimum can be cached 1,024 tokens Routing prefix hash Initial prefix used for cache routing, approximate and model-dependent about first 256 tokens Inactive retention Typical in-memory cache life without reuse 5 to 10 minutes Maximum in-memory retention Upper bound described for supported models up to 1 hour Minimum length signal Prefix stability signal Timing signal Retention ceiling

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