alt Hacker NewsChatGPT 5.6 Sol Pro believes that the proof is sound. Usually it’s very good at determining if proofs are correct and their mistakes (a friend of mine is a top mathematician researcher and confirmed): https://chatgpt.com/share/6a515ead-b464-83ed-b85c-c8674f56ea...
Personally this gives me additional confidence that this is the real deal.
Of course it believes the proof is sound, it wrote it. If you want to check an LLM's output, you should use a different LLM.