Unverified50% confidenceFactExact time

Lean 4 represents a qualitative leap over Lean 3 in performance, metaprogramming capability, and user experience, and also possesses full general-purpose programming capability

1

Sources

50%

Confidence

Medium-term (~90 days)

Relevance

9/7/2026

First Seen

Valid until: 12/6/2026

Sources

Formalizing Fermat's Last Theorem: How Lean 4 Verifies Math's Hardest Proof

Related Entities

Lean 4product Lean 3product

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