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AI · May 1, 2025

DeepSeek-Prover-V2

Advancing Formal Mathematical Reasoning via RL

DeepSeek-Prover-V2 launched on May 1, 2025 with 7 votes, #3,816 of 7,905 launches that month. The site was still online in September 2026, 1 year on.

What it does

DeepSeek-Prover-V2 is an open-source AI revolutionizing formal theorem proving in Lean 4. Powered by DeepSeek-V3, it achieves an 88.9% pass rate on MiniF2F-test and solves 49/658 PutnamBench problems.

Contribute to deepseek-ai/DeepSeek-Prover-V2 development by creating an account on GitHub.

We introduce DeepSeek-Prover-V2, an open-source large language model designed for formal theorem proving in Lean 4, with initialization data collected through a recursive theorem proving pipeline powered by DeepSeek-V3. The cold-start training procedure begins by prompting DeepSeek-V3 to decompose complex problems into a series of subgoals. The proofs of resolved subgoals are synthesized into a chain-of-thought process, combined with DeepSeek-V3's step-by-step reasoning, to create an initial cold start for reinforcement learning. This process enables us to integrate both informal and formal mathematical reasoning into a unified model. To construct the cold-start dataset, we develop a simple…from github.com

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