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---
license: apache-2.0
language:
- en
library_name: transformers
pipeline_tag: text-generation
tags:
- lean4
- theorem-proving
- formal-mathematics
- agentic
- retrieval-augmented
datasets:
- m-a-p/OProofs
---
# OProver
> A unified framework for **agentic formal theorem proving** in Lean 4.
- 📄 Paper: [OProver: A Unified Framework for Agentic Formal Theorem Proving](https://huggingface.co/papers/2605.17283) ([arXiv](https://arxiv.org/abs/2605.17283))
- 📚 Collection: [m-a-p/OProver](https://huggingface.co/collections/m-a-p/oprover)
- 📦 Dataset: [m-a-p/OProofs](https://huggingface.co/datasets/m-a-p/OProofs)
OProver treats theorem proving as a multi-round refinement loop. Given a target
theorem, the prover retrieves top-k compiler-verified proofs from a memory of
prior proofs, generates a proof attempt, runs the Lean 4 compiler, and—on
failure—revises the attempt using the compiler feedback in the next round.
The same retrieval and feedback signals are baked into training, so the
training-time interface matches the proving-time interaction.
## Highlights
- **State-of-the-art among open-weight whole-proof provers.** OProver-32B
attains the best Pass@32 on MiniF2F (93.3), ProverBench (58.2), and
PutnamBench (11.3), and the second-best on MathOlympiad (22.8) and
ProofNet (33.2). Even OProver-8B beats Goedel-Prover-V2-32B on all five
benchmarks despite having 4× fewer parameters.
- **Agentic proving is in the policy, not bolted on.** Retrieval, multi-turn
compiler feedback, and iterative repair are all part of the trained policy.
Ablations show feedback is the dominant driver: removing it costs OProver-32B
4.97.4 Pass@32 points across benchmarks; removing retrieval on top adds
0.51.7 more.
- **Co-evolving prover and corpus.** Each post-training iteration runs agentic
rollouts; verified proofs are added to OProofs and re-indexed for retrieval,
repair trajectories become SFT data, and unresolved hard cases provide RL
signal. MiniF2F-Test Pass@32 grows monotonically: OProver-8B 79.5 → 86.2 →
87.0 → 91.8 across rounds; OProver-32B 84.7 → 88.1 → 93.3.
## What's in this release
The OProver collection ([m-a-p/OProver](https://huggingface.co/collections/m-a-p/oprover)) bundles the paper,
the corpus, and seven model checkpoints covering both training stages and
both model sizes:
| Repo | Stage | Size | Note |
|---|---|---|---|
| [OProver-8B-Base](https://huggingface.co/m-a-p/OProver-8B-Base) | Continued pretraining only | 8B | Domain-adapted base; before SFT/RL |
| [OProver-32B-Base](https://huggingface.co/m-a-p/OProver-32B-Base) | Continued pretraining only | 32B | Domain-adapted base; before SFT/RL |
| [OProver-8B-Round1](https://huggingface.co/m-a-p/OProver-8B-Round1) | Post-training Round 1 | 8B | After first SFT+RL iteration |
| [OProver-8B-Round2](https://huggingface.co/m-a-p/OProver-8B-Round2) | Post-training Round 2 | 8B | After second SFT+RL iteration |
| [OProver-32B-Round1](https://huggingface.co/m-a-p/OProver-32B-Round1) | Post-training Round 1 | 32B | After first SFT+RL iteration |
| **[OProver-8B](https://huggingface.co/m-a-p/OProver-8B)** | Final | 8B | The 8B prover reported in the paper (Round 3) |
| **[OProver-32B](https://huggingface.co/m-a-p/OProver-32B)** | Final | 32B | The 32B prover reported in the paper (Round 2) |
| [OProofs](https://huggingface.co/datasets/m-a-p/OProofs) | Dataset | 6.86M proofs | Lean 4 corpus used for CPT, SFT, and the retrieval memory |
Use **OProver-8B** or **OProver-32B** for proving. The Base / Round-N
checkpoints are released for reproducibility and ablation studies.
## Dataset: OProofs
OProofs is a large-scale Lean 4 corpus that doubles as the retrieval memory at
proving time. It is built from three sources: public Lean resources
(NuminaMath-LEAN, Lean-Workbook, Leanabell-FormalStmt, Goedel-Pset, …),
large-scale autoformalization + agentic proof synthesis from informal math
mined on Common Crawl and GitHub, and traces from OProver's own agentic
proving runs.
![OProofs Lean 4 corpus statistics](./assets/oproofs.png)
## Training
Two stages, both anchored on OProofs.
**1. Continued pretraining (one-time).** A 65B-token mixture of formal
Lean (≈30%, from OProofs), code (≈20%, OpenCoder), mathematics (≈40%,
Nemotron-Math-4-Plus), and long-CoT (≈10%, ProLong-64K). AdamW, peak LR
5e-5, cosine with 3% warmup, batch 512, sequence length 8192. Output:
`OProver-{8B,32B}-Base`.
**2. Iterative post-training.** Each round runs:
1. Agentic proving with the current prover on a theorem pool, producing
multi-round rollouts conditioned on retrieved proofs and Lean feedback.
2. **SFT** on round-level repair examples `(s, R, p_{t-1}, f_{t-1}) → p_t`,
with cross-entropy loss only on the new attempt.
3. **GSPO RL** on hard cases (groups with non-trivial pass-rate). Per-round
reward `r = 0.8 + 0.2·1[format ok]` if Lean-verified, else 0; advantages
are pooled across the n×R rounds for the same theorem.
4. Newly verified proofs and repair trajectories are folded back into OProofs
and re-indexed into the retrieval memory for the next round.
## Results
Pass@32 (n=64) across five Lean 4 benchmarks. **Bold** is best, _underlined_
is second-best.
![Main results: Pass@32 across five Lean 4 benchmarks](./assets/main_results.png)
OProver-32B reaches three best and two second-best across five benchmarks —
the most top placements of any model in the comparison, despite being a
32B dense model versus a 560B MoE or a 671B dense competitor.
## Loading
```python
from transformers import AutoModelForCausalLM, AutoTokenizer
# Pick any of: OProver-8B, OProver-32B, *-Base, *-Round1, *-Round2
name = "m-a-p/OProver-8B"
tok = AutoTokenizer.from_pretrained(name)
model = AutoModelForCausalLM.from_pretrained(name, torch_dtype="bfloat16", device_map="auto")
```
```python
from datasets import load_dataset
ds = load_dataset("m-a-p/OProofs", split="train")
```
OProver is trained against a multi-round agentic interface: at each round the
input includes the target Lean statement, top-k retrieved verified proofs, the
prior proof attempt, and the Lean compiler feedback. See the paper §2.1 for
the prompt template, and Appendix B for serialization details.
## Citation
```bibtex
@article{ma2026oprover,
title = {OProver: A Unified Framework for Agentic Formal Theorem Proving},
author = {David Ma and Kaijing Ma and Shawn Guo and Yunfeng Shi and Enduo Zhao and Jiajun Shi and Zhaoxiang Zhang and Gavin Cheung and Jiaheng Liu and Zili Wang},
journal = {arXiv preprint arXiv:2605.17283},
year = {2026}
}
```

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},
"151679": {
"content": "<im_patch>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151680": {
"content": "<im_start>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151681": {
"content": "<im_end>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151682": {
"content": "<dream>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151683": {
"content": "<dream_start>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151684": {
"content": "<dream_end>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151685": {
"content": "<|MASK_1e69f|>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151686": {
"content": "<|UNMASK_1e69f|>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151687": {
"content": "<video_start>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151688": {
"content": "<video_end>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151689": {
"content": "<patch_start>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151690": {
"content": "<patch_end>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151691": {
"content": "<patch_newline>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151692": {
"content": "<begin▁of▁sentence>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151693": {
"content": "<begin▁of▁mask>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151694": {
"content": "<end▁of▁mask>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151695": {
"content": "<fim▁begin>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151696": {
"content": "<fim▁hole>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
},
"151697": {
"content": "<end▁of▁sentence>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false,
"special": true
}
},
"additional_special_tokens": [
"<|EOT|>",
"<|BOT|>",
"<|CALL_START|>",
"<|CALL_END|>",
"<|THINK_START|>",
"<|THINK_END|>",
"<|IMG_START|>",
"<|IMG_END|>",
"<|META_START|>",
"<|META_END|>",
"<im_patch>",
"<im_start>",
"<im_end>",
"<dream>",
"<dream_start>",
"<dream_end>",
"<|MASK_1e69f|>",
"<|UNMASK_1e69f|>",
"<video_start>",
"<video_end>",
"<patch_start>",
"<patch_end>",
"<patch_newline>",
"<begin▁of▁sentence>",
"<begin▁of▁mask>",
"<end▁of▁mask>",
"<fim▁begin>",
"<fim▁hole>",
"<end▁of▁sentence>"
],
"bos_token": null,
"chat_template": "{%- if tools %}\n {{- '<|im_start|>system\\n' }}\n {%- if messages[0].role == 'system' %}\n {{- messages[0].content + '\\n\\n' }}\n {%- endif %}\n {{- \"# Tools\\n\\nYou may call one or more functions to assist with the user query.\\n\\nYou are provided with function signatures within <tools></tools> XML tags:\\n<tools>\" }}\n {%- for tool in tools %}\n {{- \"\\n\" }}\n {{- tool | tojson }}\n {%- endfor %}\n {{- \"\\n</tools>\\n\\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\\n<tool_call>\\n{\\\"name\\\": <function-name>, \\\"arguments\\\": <args-json-object>}\\n</tool_call><|im_end|>\\n\" }}\n{%- else %}\n {%- if messages[0].role == 'system' %}\n {{- '<|im_start|>system\\n' + messages[0].content + '<|im_end|>\\n' }}\n {%- endif %}\n{%- endif %}\n{%- set ns = namespace(multi_step_tool=true, last_query_index=messages|length - 1) %}\n{%- for message in messages[::-1] %}\n {%- set index = (messages|length - 1) - loop.index0 %}\n {%- if ns.multi_step_tool and message.role == \"user\" and message.content is string and not(message.content.startswith('<tool_response>') and message.content.endswith('</tool_response>')) %}\n {%- set ns.multi_step_tool = false %}\n {%- set ns.last_query_index = index %}\n {%- endif %}\n{%- endfor %}\n{%- for message in messages %}\n {%- if message.content is string %}\n {%- set content = message.content %}\n {%- else %}\n {%- set content = '' %}\n {%- endif %}\n {%- if (message.role == \"user\") or (message.role == \"system\" and not loop.first) %}\n {{- '<|im_start|>' + message.role + '\\n' + content + '<|im_end|>' + '\\n' }}\n {%- elif message.role == \"assistant\" %}\n {%- set reasoning_content = '' %}\n {%- if message.reasoning_content is string %}\n {%- set reasoning_content = message.reasoning_content %}\n {%- else %}\n {%- if '</think>' in content %}\n {%- set reasoning_content = content.split('</think>')[0].rstrip('\\n').split('<think>')[-1].lstrip('\\n') %}\n {%- set content = content.split('</think>')[-1].lstrip('\\n') %}\n {%- endif %}\n {%- endif %}\n {%- if loop.index0 > ns.last_query_index %}\n {%- if loop.last or (not loop.last and reasoning_content) %}\n {{- '<|im_start|>' + message.role + '\\n<think>\\n' + reasoning_content.strip('\\n') + '\\n</think>\\n\\n' + content.lstrip('\\n') }}\n {%- else %}\n {{- '<|im_start|>' + message.role + '\\n' + content }}\n {%- endif %}\n {%- else %}\n {{- '<|im_start|>' + message.role + '\\n' + content }}\n {%- endif %}\n {%- if message.tool_calls %}\n {%- for tool_call in message.tool_calls %}\n {%- if (loop.first and content) or (not loop.first) %}\n {{- '\\n' }}\n {%- endif %}\n {%- if tool_call.function %}\n {%- set tool_call = tool_call.function %}\n {%- endif %}\n {{- '<tool_call>\\n{\"name\": \"' }}\n {{- tool_call.name }}\n {{- '\", \"arguments\": ' }}\n {%- if tool_call.arguments is string %}\n {{- tool_call.arguments }}\n {%- else %}\n {{- tool_call.arguments | tojson }}\n {%- endif %}\n {{- '}\\n</tool_call>' }}\n {%- endfor %}\n {%- endif %}\n {{- '<|im_end|>\\n' }}\n {%- elif message.role == \"tool\" %}\n {%- if loop.first or (messages[loop.index0 - 1].role != \"tool\") %}\n {{- '<|im_start|>user' }}\n {%- endif %}\n {{- '\\n<tool_response>\\n' }}\n {{- content }}\n {{- '\\n</tool_response>' }}\n {%- if loop.last or (messages[loop.index0 + 1].role != \"tool\") %}\n {{- '<|im_end|>\\n' }}\n {%- endif %}\n {%- endif %}\n{%- endfor %}\n{%- if add_generation_prompt %}\n {{- '<|im_start|>assistant\\n' }}\n {%- if enable_thinking is defined and enable_thinking is false %}\n {{- '<think>\\n\\n</think>\\n\\n' }}\n {%- endif %}\n{%- endif %}",
"clean_up_tokenization_spaces": false,
"eos_token": "<|im_end|>",
"errors": "replace",
"extra_special_tokens": {},
"model_max_length": 131072,
"pad_token": "<|endoftext|>",
"split_special_tokens": false,
"tokenizer_class": "Qwen2Tokenizer",
"unk_token": null
}

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vocab.json (Stored with Git LFS) Normal file

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