AINewsnow

I put a timestamp in my system prompt, and the cache never hit

I did not know prompt caching existed. I knew the API billed me per token, and I knew a long conversation cost more than a short one. What I did not know was that providers keep the processed prefix of a prompt around and charge a fraction of the price to reuse it. So when I looked at the usage lin…

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  1. 2026-11-04 08:05 · DEV Community — AI
    I put a timestamp in my system prompt, and the cache never hit

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