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Anthropic AI ‘formalizes’ proof of Fermat’s last theorem in just 11 days

AchievementResearchSep 7, 2026

Anthropic AI announced on 4 September that Claude has converted the proof of Fermat's last theorem into 13 million lines of computer-verified code, completing in 11 days a project expected to take humans ten years. Alex Kontorovich of Rutgers University called the result mind-blowing, and Kevin Buzzard of Imperial College London said it was an order of magnitude more difficult than prior AI formalization work.

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ClaudeModelImperial College LondonCompanyAnthropic AICompanyRutgers UniversityCompanyAlex KontorovichPersonKevin BuzzardPerson
Canonical: https://www.nature.com/articles/d41586-026-02822-9