FormalTCS - Autoformalization: leaderboard
Metric: BEq+ equivalence rate (%; natural-language theorem translated to a Lean 4 statement, counted when bidirectional proof search shows it equivalent to the reference statement; 8 sampled candidates per instance at temperature 0.6; 143 instances from theoretical computer science papers accepted at STOC, FOCS, SODA, COLT and similar venues in 2025-2026, each stage given the human-annotated input; each model runs in its own vendor harness). Source: arxiv.org. Saturation forecast: Around 2029. 8 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Opus 5 (Claude Code) | 11.2 |
| 2 | GPT-5.6 Sol (Codex) | 10.5 |
| 3 | Claude Sonnet 5 (Claude Code) | 9.1 |
| 4 | Claude Haiku 4.5 (Claude Code) | 2.1 |
Interactive version: theaggregate.ai/benchmark?slug=formaltcs-autoformalization · How It Works · Data refreshed daily, snapshot 2026-09-26.