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Claude Prompt Caching Hit Rate Was 0%. One Timestamp Did It

This story is from 2026-09-29. It is preserved in the archive; the latest stories are on the live feed.

I turned on Claude prompt caching, shipped it, and moved on. Nine days later I looked at the usage logs and saw cache_read_input_tokens: 0 on every one of 3,412 calls. Not a low hit rate. Zero. And it was worse than zero, because every one of those calls paid the cache write premium. Turning on cac…

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  1. 2026-09-29 22:59 · DEV Community — AI
    Claude Prompt Caching Hit Rate Was 0%. One Timestamp Did It

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