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OpenAI reorganized its Model Spec, the rules for how its models should behave, around five values and retired most of the style guidelines; OpenAI says the models don't yet fully behave as the new version describes.

(OpenAI, 2026-10-29) How we checked →

Concept illustration on a pale green background: on the right, an open green ring binder whose left page is lettered OPENAI MODEL SPEC beside an interlaced knot-shaped symbol and whose right page is lettered VALUES, with five red index tabs along its edge. On the left, a stack of tabbed pages is tied with twine in a bow, its top page lettered STYLE RULES, and between the two a hand in a beige sleeve reaches up from the bottom holding a small stack of hole-punched tabbed pages.

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This item ran in the brief of Oct 30, 2026, alongside 13 other items. How we checked it, the quote checks and what was still missing that day are on that issue's How we checked page.

Cite this item

SecondSource (2026). "OpenAI reorganized its Model Spec, the rules for how its models should behave, around five values and retired most of the style guidelines; OpenAI says the models don't yet fully behave as the new version describes.." https://secondsource.io/en/product/2026-10-30-1/. Accessed access date.