CharTool-7B is a tool-integrated multimodal agent for fine-grained chart perception and accurate numerical reasoning. It can use image cropping for localized visual perception and Python code execution for numerical computation.

📋 Model Details

Base model: Qwen2.5-VL-7B-Instruct
Training: Cold-start supervised fine-tuning followed by agentic reinforcement learning on DuoChart
Parameters: 7B

🚀 Usage

CharTool relies on a tool-integrated inference loop and a code sandbox. Please follow the evaluation instructions in the CharTool repository.

Use this Hugging Face repository as the model path:

bash

python src/generate.py \
    --model_name chartool \
    --split val \
    --mode reasoning \
    --model_path OpenDFM/CharTool-7B

📝 Citation

bibtex

@article{zhang2026chartool,
  title   = {CharTool: Tool-Integrated Visual Reasoning for Chart Understanding},
  author  = {Zhang, Situo and Zhang, Yifan and Zhu, Zichen and Ma, Da and Pan, Lei and Zhang, Danyang and Zhao, Zihan and Chen, Lu and Yu, Kai},
  journal = {arXiv preprint arXiv:2604.02794},
  year    = {2026}
}