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Anthropic's Fermat Proof Is an Autoformalization Milestone

Anthropic's Lean formalization of Fermat's Last Theorem, read for developers: what Claude verified in 11 days and the repo patterns worth copying.

September 5, 2026•7 min read

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Leanstral 1.5: Mistral's Open Theorem-Proving Model Hits 100% on miniF2F

Leanstral 1.5 is Mistral's open Apache-2.0 model for Lean 4 theorem proving. The benchmark claims, the HN pushback on its bug-finding pitch, and how to use it.

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FORMAL VERIFICATION

Anthropic's Fermat Proof Is an Autoformalization Milestone

Leanstral 1.5: Mistral's Open Theorem-Proving Model Hits 100% on miniF2F

Keep exploring Formal Verification

FORMAL VERIFICATION

Anthropic's Fermat Proof Is an Autoformalization Milestone

Leanstral 1.5: Mistral's Open Theorem-Proving Model Hits 100% on miniF2F

Keep exploring Formal Verification

FORMAL VERIFICATION

Anthropic's Fermat Proof Is an Autoformalization Milestone

Leanstral 1.5: Mistral's Open Theorem-Proving Model Hits 100% on miniF2F

Keep exploring Formal Verification

Get Smarter About AI Dev

FORMAL VERIFICATION

Anthropic's Fermat Proof Is an Autoformalization Milestone

Leanstral 1.5: Mistral's Open Theorem-Proving Model Hits 100% on miniF2F

Keep exploring Formal Verification

Get Smarter About AI Dev