Your Cache Key Is Not Your Prompt: Four Response-Cache Myths and a Collision Test
This story is from 2026-11-05. It is preserved in the archive; the latest stories are on the live feed.
You put a cache in front of your model calls. The first week looks great. Then a ticket lands: same question, different answer. Sometimes. Your prompt did not change. Your key did not change either. That is the bug. Caching a model response is a claim about equivalence. Most teams never write that…
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- 2026-11-05 13:51 · DEV Community — AI
Your Cache Key Is Not Your Prompt: Four Response-Cache Myths and a Collision Test