RL Pioneer Csaba Szepesvari Grills Anthropic on Claude's Fermat Proof

CsabaSzepesvari · x · 2026-09-05

RL pioneer Csaba Szepesvari publicly pressed Anthropic on how we can know the formalization behind Claude's proof is correct, asking for an honest account of verification efforts and their limits.

Context: Anthropic said Claude last month completed the first formalized proof of Fermat's Last Theorem in Lean — a project experts expected to take years and the largest Lean project to date.

Related event: Claude Completes First Machine-Verified Formal Proof of Fermat's Last Theorem(26 posts)→

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