Anthropic's 1,000-agent Fable 5.2 team reproduces a formal proof of Fermat's Last Theorem
RLanceMartin · x · 2026-11-10
Anthropic researchers report that a team of 1,000 agents running an early version of Claude Fable 5.2 reproduced a Lean formalization of Fermat's Last Theorem — without the Prove2Me scaffolding or researcher steering used in their September run.
- The team finished in 28.7 hours, used one-third the output tokens, and wrote a proof one-seventh the length of the original, coordinating via just a shared database and git.
- Agents got 60 statements, a one-sentence sketch of the classical route, definitions, and 47 proved lemmas, with lead/helper roles; everything else was self-organized.
- Safety: each agent ran in a network-isolated sandbox, every shell command and file edit passed a blocking classifier, plus an offline monitor reviewed all actions.
- Authors call it a toy experiment, but say it shows agent teams can pursue ambitious long-horizon goals within layered safety boundaries.
Related event: 1000 Fable 5.2 Agents Fully Formalize Fermat's Last Theorem in 30 Hours(6 posts)→
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