> The result is also contained in a paper [8] released by OpenAI on October 6, 2026, in which the proof strategy and specific choices of notation are identical to a preliminary version of the present paper that was uploaded to ChatGPT on September 8, 2026.

Make of those claims what you will; knowing now how they operate and how they are happy to take chat logs and convert them into new papers that they claim credit for, there's at least a non-zero probability that that's what happen here.

And imagine being completely fine with the risk of stealing work from students to produce marketing material. Who cares about their career prospectives anyway.