AI Agents Formalize Major Proof in Lean in a Week for ~$135K, Producing 600K Lines
geoffreyirving · x · 2026-10-07
- AI agents wrote a Lean formalization in about a week that observers call one of the most impressive to date, comparing it to the Liquid Tensor Experiment and Fermat's Last Theorem.
- The proof follows Hironaka and more modern approaches by Kollár and Włodarczyk, written end-to-end by the agents.
- Scale: 300M output tokens, $135K in cost, and 600K lines of Lean produced.
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