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Anthropic reports Claude Fable 5.2 agents formalized Fermat's Last Theorem in Lean in 30 hours

·2026.11.13 00:07

Key point

The 30-hour proof used about a third of the action tokens and was roughly 7x shorter than the 11-day September run.

Details

  • Approximately 1,000 Claude Fable 5.2 agents produced a complete Lean formalization of Fermat's Last Theorem in 30 hours with minimal human intervention.
  • The new run used about a third of the action tokens and generated a proof roughly 7x shorter than the first formalization completed in September by an unreleased Claude model in 11 days.
  • The same 1,000-agent setup using Opus 5.5 reached only 26% completion in 18 hours and barely progressed after 30 hours.
  • The September proof is public on GitHub with about 13M lines and 29,511 theorems, while the 30-hour proof has not yet been linked publicly.
  • The formalization is verified by the Lean kernel, distinguishing it from unverified agent claims, though the proof is longer than a human-written formalization would be.
anthropicai-agentsformal-verificationleanfermat-last-theoremclaude-fable-5.2
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