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Goedel-Prover-V2: Scaling Formal Theorem Proving with Scaffolded Data Synthesis and Self-Correction

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abstract

We introduce Goedel-Prover-V2, a series of open-source language models that set a new state-of-the-art in automated theorem proving. Built on the standard expert iteration and reinforcement learning pipeline, our approach incorporates three key innovations: (1) Scaffolded data synthesis: We generate synthetic tasks of increasing difficulty to train the model to master increasingly complex theorems; (2) Verifier-guided self-correction: We enable the model to iteratively revise its proofs by leveraging feedback from the Lean compiler; (3) Model averaging: We merge model checkpoints to mitigate the decrease in model output diversity in later stages of training. Our small model, Goedel-Prover-V2-8B, reaches 84.6% pass@32 on MiniF2F and outperforms DeepSeek-Prover-V2-671B under the same metric, despite being 80X smaller. Our flagship model, Goedel-Prover-V2-32B, achieves 88.1% on MiniF2F at pass@32 in standard mode and 90.4% in self-correction mode, outperforming prior SOTA by a large margin. Additionally, our flagship model solves 86 problems on PutnamBench at pass@184, securing the first place among open-source models on the leaderboard, surpassing DeepSeek-Prover-V2-671B's record of solving 47 problems by pass@1024 with a significantly smaller model size and compute budget. At the time of its release (July-August 2025), Goedel-Prover-V2 achieves the strongest overall performance among all open-source theorem provers. It also ranks among the top-performing models--including closed-source systems with publicly reported performance--under a constrained test-time compute budget. Our models, code, and data are released at https://github.com/Goedel-LM/Goedel-Prover-V2.

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representative citing papers

MathAtlas: A Benchmark for Autoformalization in the Wild

cs.AI · 2026-05-13 · accept · novelty 8.0

MathAtlas is the first large-scale benchmark for autoformalizing graduate mathematics, where even strong models reach only 9.8% correctness on theorem statements and drop to 2.6% on the hardest dependency-deep subset.

Automatic Textbook Formalization

cs.AI · 2026-04-03 · accept · novelty 7.0

Multi-agent AI system formalizes entire 500-page graduate algebraic combinatorics textbook into Lean, creating 130K lines of code in one week at human-expert cost.

OProver: A Unified Framework for Agentic Formal Theorem Proving

cs.CL · 2026-05-17 · unverdicted · novelty 6.0

OProver-32B achieves top Pass@32 scores on MiniF2F, ProverBench, and PutnamBench by combining continued pretraining with iterative agentic proving, retrieval, SFT on repairs, and RL on unresolved cases using a 6.86M-proof dataset.

Ablation and the Meno: Tools for Empirical Metamathematics

cs.LO · 2026-04-24 · unverdicted · novelty 6.0

Meno and tactic ablation on Tao's Analysis I generate proof populations that embed on low one- or two-dimensional submanifolds far from human constructions in Goedel Prover space.

Scaling Self-Play with Self-Guidance

cs.LG · 2026-04-22 · unverdicted · novelty 6.0

SGS adds self-guidance to LLM self-play for Lean4 theorem proving, surpassing RL baselines and enabling a 7B model to outperform a 671B model after 200 rounds.

A Minimal Agent for Automated Theorem Proving

cs.AI · 2026-02-27 · unverdicted · novelty 6.0

A minimal agentic system achieves competitive performance in automated theorem proving with a simpler design and lower cost than state-of-the-art methods.

Pseudo-Formalization for Automatic Proof Verification

cs.LO · 2026-05-19 · unverdicted · novelty 5.0

Pseudo-Formalization decomposes natural language proofs into modular blocks for independent LLM verification via Block Verification, outperforming LLM-as-judge baselines on error detection in olympiad and research math benchmarks.

Code as Agent Harness

cs.CL · 2026-05-18 · accept · novelty 5.0

A survey that organizes existing work on LLM-based agents around code as the central harness, structured in three layers of interfaces, mechanisms, and multi-agent scaling, with applications across domains and listed open challenges.

On Reasoning-Centric LLM-based Automated Theorem Proving

cs.SE · 2026-04-21 · unverdicted · novelty 5.0

ReCent-Prover achieves a 22.58% relative improvement over prior state-of-the-art in proved theorems on the CoqStoq benchmark by using reasoning-centric techniques under a fixed LLM invocation budget.

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Showing 26 of 26 citing papers.