Kimina-Autoformalizer-7B is a autoformalizer model developed by Project Numina, focusing on translating natural language descriptions of competition style problems to Lean 4 code ending with by sorry.

Quick Start with vLLM

You can easily do inference using vLLM:

from vllm import LLM, SamplingParams
from transformers import AutoTokenizer

model_name = "AI-MO/Kimina-Autoformalizer-7B"
model = LLM(model_name)

tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)

problem = "The volume of a cone is given by the formula $V = \frac{1}{3}Bh$, where $B$ is the area of the base and $h$ is the height. The area of the base of a cone is 30 square units, and its height is 6.5 units. What is the number of cubic units in its volume? The answer is 65."

prompt = "Please autoformalize the following problem in Lean 4 with a header. Use the following theorem names: my_favorite_theorem.\n\n"
prompt += problem

messages = [
    {"role": "system", "content": "You are an expert in mathematics and Lean 4."},
    {"role": "user", "content": prompt}
]

text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True
)

sampling_params = SamplingParams(temperature=0.6, top_p=0.95, max_tokens=2048)
output = model.generate(text, sampling_params=sampling_params)
output_text = output[0].outputs[0].text
print(output_text)

Citation

If you find our work helpful, you can cite our paper: https://github.com/MoonshotAI/Kimina-Prover-Preview

@article{kimina_prover_2025,
	title = {Kimina-Prover Preview: Towards Large Formal Reasoning Models with Reinforcement Learning},
	author = {Wang, Haiming and Unsal, Mert and Lin, Xiaohan and Baksys, Mantas and Liu, Junqi and Santos, Marco Dos and Sung, Flood and Vinyes, Marina and Ying, Zhenzhe and Zhu, Zekai and Lu, Jianqiao and Saxcé, Hugues de and Bailey, Bolton and Song, Chendong and Xiao, Chenjun and Zhang, Dehao and Zhang, Ebony and Pu, Frederick and Zhu, Han and Liu, Jiawei and Bayer, Jonas and Michel, Julien and Yu, Longhui and Dreyfus-Schmidt, Léo and Tunstall, Lewis and Pagani, Luigi and Machado, Moreira and Bourigault, Pauline and Wang, Ran and Polu, Stanislas and Barroyer, Thibaut and Li, Wen-Ding and Niu, Yazhe and Fleureau, Yann and Hu, Yangyang and Yu, Zhouliang and Wang, Zihan and Yang, Zhilin and Liu, Zhengying and Li, Jia},
	year = {2025},
	url = {http://arxiv.org/abs/2504.11354},
}