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Your LLM Structured Output Parser Is Lying To You

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

You have probably written a loop that calls an LLM, parses the response as JSON, and feeds it into your pipeline. It works on Monday. By Wednesday, the model returns a string where a field is null instead of an integer, or an extra key appears, and your downstream code crashes in production. This i…

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  1. 2026-09-16 00:45 · DEV Community — AI
    Your LLM Structured Output Parser Is Lying To You

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