Mistral's Leanstral 1.5 Proves Code Can Be Verified, Not Just Banned

2026-07-04 · 4 min read

Within 48 hours of Godot ban on AI-generated contributions, Mistral AI dropped an answer that reframes the entire debate. Leanstral 1.5 is an open-source model purpose-built for Lean 4 formal proof engineering. It does not generate code that might work. It generates code that can be proven correct.

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Mistral's Leanstral 1.5 Proves Code Can Be Verified, Not Just Banned

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