Lean 4 Articles

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8/1/2026 • EN

Ten advances in mathematics and theoretical computer science

OpenAI uses internal Astra model to solve ten long-standing math problems, with Lean 4 formalizations and a paper, sparking debate on AI's role in mathematics.

artificial intelligence Lean 4 mathematics Openai Theorem Proving

Simon Willison

7/20/2026 • EN

Solving a chess puzzle with Grok 4.5

Testing Grok 4.5's ability to generate Prolog and Lean code for a chess puzzle variation of the n-queens problem.

Chess Puzzle Clpfd Lean 4 N Queens Prolog

John D. Cook

6/15/2026 • EN

Quaternion Rotations, Claude, and Lean

Using Claude and Lean to verify quaternion rotation matrix formulas, detecting a typo in the process.

Claude lean Lean 4 Quaternions Rotation Matrices

John D. Cook

3/17/2026 • EN

Introducing Mistral Small 4

Mistral AI releases Mistral Small 4, a new 119B parameter open model combining reasoning, multimodal, and coding capabilities.

api Lean 4 llm Mistral AI Mixture Of Experts