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Prompt Caching Only Saves Money If Your Prompts Actually Repeat

Prompt caching sounds like free money. Send the same long instructions once, reuse them, and pay less on later requests. In practice, the saving depends on one question: how much of your prompt really repeats, word for word, from one request to the next? A system prompt that never changes is a good…

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  1. 2026-10-31 21:37 · DEV Community — AI
    Prompt Caching Only Saves Money If Your Prompts Actually Repeat

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