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6 Things That Quietly Break Your LLM Prompt Cache in .NET

I had a support bot that sent the same 1,300-token system prompt on every request, and I assumed the provider's prompt cache was doing its job. OpenAI and Azure OpenAI cache long prompt prefixes automatically, and for the models I priced, cached input costs a tenth of normal input. Free money, as l…

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  1. 2026-11-14 12:57 · DEV Community — AI
    6 Things That Quietly Break Your LLM Prompt Cache in .NET

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