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Prompt Caching Isn't Enough

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

You turned on prompt caching expecting your repeated questions to get cheap, and your input tokens did get a discount. But the model still wakes up, still reasons through the task, still calls every tool, and still writes the whole answer from scratch, every single time, even when someone asks the…

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  1. 2026-09-11 05:02 · DEV Community — AI
    Prompt Caching Isn't Enough

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