OpenAI Strict Mode Drops Constraints Like Pattern and Min/Max

Business-Dig-6131 · reddit · 2026-08-26

A technical measurement shows that OpenAI's Structured Outputs strict mode drops constraint keywords like pattern and minItems. Acceptance rates jumped from 2/72 to 36/72 in tests. The author advises validating outputs against the original schema and released a library schema-envoy to help.

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