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The context-per-turn cost bomb: keep the cache warm, or run the loop in a cheaper model

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

The context-per-turn cost bomb: keep the cache warm, or run the loop in a cheaper model Every turn of an agent loop re-sends the entire context. Prompt caching is what makes that affordable, so anything that quietly invalidates the cache turns a cheap loop into an expensive one, one full-price cont…

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  1. 2026-09-02 15:09 · DEV Community — AI
    The context-per-turn cost bomb: keep the cache warm, or run the loop in a cheaper model

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