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How do you know your long shared prefix is really being cached?

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

NGL I expected our long shared prefix to cache well. Then we found a request identifier inserted near the top of the prompt, before the stable instructions, tool schemas and retrieved policies. That tiny field changed every call, so the provider reprocessed thousands of shared tokens. Average cost…

Read the full story at r/AI_Agents ↗

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  1. 2026-09-02 14:40 · r/AI_Agents
    How do you know your long shared prefix is really being cached?

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