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TRUE, BUT

OpenAI said a Lean formalization backed its Navier-Stokes proof. An arXiv paper finds the Lean code uses five extra derivatives where the written proof claims four.

OpenAI, research post (8 Sep 2026); its Lean check tested in an arXiv paper (6 Oct 2026). Recorded 14 October 2026. Our ruling means: literally true, materially misleading.

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13 receipts: 2 support the claim, 4 contradict it, 7 add context. 1 figure on the record, 0 traced to a quoted receipt.

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