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How do you regression-test prompts after a model version change?

This story is from 2026-09-10. It is preserved in the archive; the latest stories are on the live feed.

When a provider changes the model behind an existing name, prompt behavior can shift even if the request format stays the same. I am building a small evaluation set with normal cases, edge cases, structured-output checks, long-context examples, and a few deliberately ambiguous prompts, then compari…

Read the full story at r/PromptEngineering ↗

Timeline · 2 reports

  1. 2026-09-11 20:58 · r/PromptEngineering
    How do you regression-test prompts after switching the underlying model?
  2. 2026-09-10 22:06 · r/PromptEngineering
    How do you regression-test prompts after a model version change?

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