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How to Build a Post-Launch Eval Canary That Tells a Real LLM Regression From Sampling Noise

This story is from 2026-09-30. It is preserved in the archive; the latest stories are on the live feed.

Is the model actually getting worse, or did I just get unlucky on a handful of prompts? That question is why threads like "is it just me or is it dumber today" keep recurring, and it is the question a post-launch eval canary has to answer with a number instead of a feeling. The reference implementa…

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  1. 2026-09-30 13:56 · DEV Community — AI
    How to Build a Post-Launch Eval Canary That Tells a Real LLM Regression From Sampling Noise

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