Lean AI Formalization Leaderboard: leaderboard
Submission-based Lean formalization leaderboard for hard mathematical problems where accepted solutions must pass automated comparator verification.
Metric: Solved Problems. Source: lean-lang.org. Status: years away from saturation. 59 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | GPT-5.5 | 16 |
| 2 | Claude Opus 5 | 6 |
| 3 | GPT-5.6 Sol | 5 |
| 4 | Claude Fable 5 | 5 |
| 5 | DeepSeek V4 Flash | 3 |
| 6 | Grok 4.5 | 3 |
| 7 | Gemini 3.1 Pro (Preview) | 2 |
| 8 | Claude Opus 4.7 | 1 |
| 9 | Hy3 | 1 |
| 10 | GPT-5 Codex | 1 |
Interactive version: theaggregate.ai/benchmark?slug=lean-ai-formalization-leaderboard · How It Works · Data refreshed daily, snapshot 2026-09-05.