base_model:

• Qwen/Qwen2.5-Math-1.5B datasets:
• nvidia/OpenMathReasoning language:
• en library_name: transformers license: cc-by-4.0 tags:
• nvidia
• math pipeline_tag: text-generation

OpenMath-Nemotron-1.5B

OpenMath-Nemotron-1.5B is created by finetuning Qwen/Qwen2.5-Math-1.5B on OpenMathReasoning dataset. This model is ready for commercial use.

OpenMath-Nemotron models achieve state-of-the-art results on popular mathematical benchmarks. We present metrics as pass@1 (maj@64) where pass@1 is an average accuracy across 64 generations and maj@64 is the result of majority voting. Please see our paper for more details on the evaluation setup.

We used a version of OpenMath-Nemotron-14B model to secure the first place in AIMO-2 Kaggle competition!

Reproducing our results

The pipeline we used to produce the data and models is fully open-sourced!

• Code
• Models
• Dataset
• Paper

We provide all instructions to fully reproduce our results, including data generation.

How to use the models?

Our models can be used in 3 inference modes: chain-of-thought (CoT), tool-integrated reasoning (TIR) and generative solution selection (GenSelect).

To run inference with CoT mode, you can use this example code snippet.

import transformers
import torch

model_id = "nvidia/OpenMath-Nemotron-1.5B"

pipeline = transformers.pipeline(
    "text-generation",
    model=model_id,
    model_kwargs={"torch_dtype": torch.bfloat16},
    device_map="auto",
)

messages = [
    {
        "role": "user", 
        "content": "Solve the following math problem. Make sure to put the answer (and only answer) inside \\boxed{}.

" + 
        "What is the minimum value of $a^2+6a-7$?"},
]

outputs = pipeline(
    messages,
    max_new_tokens=4096,
)
print(outputs[0]["generated_text"][-1]['content'])

To run inference with TIR or GenSelect modes, we highly recommend to use our reference implementation in NeMo-Skills.

Please note that these models have not been instruction tuned on general data and thus might not provide good answers outside of math domain.

Citation

If you find our work useful, please consider citing us!

@article{moshkov2025aimo2,
  title   = {AIMO-2 Winning Solution: Building State-of-the-Art Mathematical Reasoning Models with OpenMathReasoning dataset},
  author  = {Ivan Moshkov and Darragh Hanley and Ivan Sorokin and Shubham Toshniwal and Christof Henkel and Benedikt Schifferer and Wei Du and Igor Gitman},
  year    = {2025},
  journal = {arXiv preprint arXiv:2504.16891}
}

Additional information

License/Terms of Use:

GOVERNING TERMS: Use of this model is governed by CC-BY-4.0. Additional Information: Apache License Version 2.0.

Deployment Geography:

Global

Use Case:

This model is intended to facilitate research in the area of mathematical reasoning.

Release Date:  

Huggingface 04/23/2025

Model Architecture:

Architecture Type: Transformer decoder-only language model  

Network Architecture: Qwen2.5

**This model was developed based on Qwen2.5-1.5B

** This model has 1.5B of model parameters.

Input:

Input Type(s): Text

Input Format(s): String

Input Parameters: One-Dimensional (1D)

Other Properties Related to Input: Context length up to 131,072 tokens

Output:

Output Type(s): Text

Output Format: String

Output Parameters: One-Dimensional (1D)

Other Properties Related to Output: Context length up to 131,072 tokens

Our AI models are designed and/or optimized to run on NVIDIA GPU-accelerated systems. By leveraging NVIDIA’s hardware (e.g. GPU cores) and software frameworks (e.g., CUDA libraries), the model achieves faster training and inference times compared to CPU-only solutions.

Software Integration :

Runtime Engine(s):

• Tensor RT / Triton
  

Supported Hardware Microarchitecture Compatibility:

• NVIDIA Ampere
  

• NVIDIA Hopper
  

Preferred Operating System(s):

• Linux
  

Model Version(s):

OpenMath-Nemotron-1.5B

OpenMath-Nemotron-7B

OpenMath-Nemotron-14B

OpenMath-Nemotron-32B

Ethical Considerations:

NVIDIA believes Trustworthy AI is a shared responsibility and we have established policies and practices to enable development for a wide array of AI applications.  When downloaded or used in accordance with our terms of service, developers should work with their internal model team to ensure this model meets requirements for the relevant industry and use case and addresses unforeseen product misuse.

For more detailed information on ethical considerations for this model, please see the Model Card++ Explainability, Bias, Safety & Security, and Privacy Subcards.

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