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How do you regression-test prompts after switching the underlying model?

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

A prompt can look stable while the model behind it changes its instruction following, formatting, or tool-call behavior. I am putting together a small evaluation set with representative inputs, expected constraints, and a few borderline cases. Do you compare outputs manually, use a judge model, or…

Read the full story at r/PromptEngineering ↗

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  1. 2026-09-11 20:58 · r/PromptEngineering
    How do you regression-test prompts after switching the underlying model?

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