Lean4: How the theorem prover works and why it's the new competitive edge in AI

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VentureBeat guest post. Documents Lean4 adoption by OpenAI, Meta, Google DeepMind (AlphaProof), and Harmonic AI ($100M raised). Key framing: formal verification as a “safety net” for LLMs — each reasoning step translated to Lean4 and proof-checked. VeriBench benchmark: LLMs verify only 12% of code challenges in Lean4, but iterative agent approach reaches 60%.