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Anthropic says Claude worked "largely autonomously" over 11 days to formalize the proof of Fermat's Last Theorem in the Lean programming language (Anthropic)
https://www.anthropic.com/research/formalizing-fermats-last-theorem

Formalizing Fermat's Last Theorem
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

And it fit in the margin of a book.
https://www.newscientist.com/article/2587839-fermats-last-theorem-formalised-by-ai-agents-in-just-11-days/?utm_id=97758_v0_s00_e0_tv4_a1demo0ecg7rma

Fermat's last theorem formalised by AI agents in just 11 days | New Scientist
Converting the proof of Fermat's last theorem into code that computers can check was expected to take years. Anthropic's Claude AI managed it in less than two weeks

https://www.anthropic.com/research/formalizing-fermats-last-theorem
Holy cow.

Formalizing Fermat's Last Theorem
Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.