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What is the smallest prompt regression set you trust after a model switch?

This story is from 2026-09-15. It is preserved in the archive; the latest stories are on the live feed.

When a model alias changes or a provider rolls out a new version, I want to catch behavior drift without rerunning an entire evaluation suite. My current idea is a small set of production-like inputs with structured checks for tool use, formatting, and refusal behavior, plus a manual review of the…

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  1. 2026-09-15 22:25 · r/PromptEngineering
    What is the smallest prompt regression set you trust after a model switch?

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