Proofs on the Whiteboard: GPT-5 and the First Proof Challenge

We unpack OpenAI’s February 2026 first proof challenge, where GPT-5 and GPT-5.2 used a true internal reasoning process—more like a tree search than a word predictor—to tackle 10 research-grade problems in topology and physics. Through a collaborative generate-solve-refine workflow with human supervision, the model solved five problems (4, 5, 6, 9, 10) and had problem 2 retracted after peer review. We dive into the one-sided matrix barrier argument in problem 6 and discuss what this means for AI as a true reasoning partner in science and industry. 

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