Meta and NYU propose h1, a simple Lean proof loop for theorem proving

1. 2:25 PM
   Rohan Paul@rohanpaul_aiX

   Meta and NYU paper finds simple Lean loop matches hand-built theorem-proving workflows

   AIMeta and NYU researchers present h1, a loop that gives a model fast Lean feedback and search tools without imposing a fixed plan. With the same model, h1 solved 598 of 672 PutnamBench problems against 597 for the hand-built Goedel-Architect, at $1.08 per problem against $1.47. The paper also reports that with Opus 4.8, h1 solved 83 of 100 hard algebra problems, versus 63 for Claude Code.

   

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