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Prompt Caching in Pydantic AI: Up to 89% Lower Input Costs

This story is from 2026-10-23. It is preserved in the archive; the latest stories are on the live feed.

This article is for AI developers who want to build an AI agent with Pydantic AI that uses changing instructions and still saves costs. The problem is that Pydantic AI used to put static and dynamic instructions in the same block, so one small change broke the whole cache. Below, I show how it work…

Read the full story at DEV Community — AI ↗

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  1. 2026-10-23 07:15 · DEV Community — AI
    Prompt Caching in Pydantic AI: Up to 89% Lower Input Costs

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