JanusCoder

JanusCoder: Towards a Foundational Visual-Programmatic Interface for Code Intelligence

🗞️ Updates

• 2025-10-29: We release the checkpoints of JanusCoder series 🤗
• 2025-10-07: Initial release of our technical report, code, data samples, and 🌐 Project Page. Check it out! 🚀

Note

This release represents the public implementation; the full implementation and data will be made available after internal company policy requirements are met.

📑 Intro

JanusCoder is a suite of open models that establish a unified visual–programmatic interface for multimodal code intelligence. The models (JanusCoder and JanusCoderV) handle text-centric and vision-centric tasks in a single framework—from chart-to-code and web UI generation/editing to dynamic theorem visualizations—and show strong results across public benchmarks, approaching or even surpassing proprietary systems.

Note

Due to company policy, we need some additional time to release all datasets and checkpoints. If you require access to more data, please feel free to send qiushisun@connect.hku.hk an email.

🤗 Checkpoints

We provide the checkpoints of JanusCoder series on Hugging Face:

Model Name	Description	Download
JanusCoder-8B	8B text model based on Qwen3-8B.	🤗 Model
JanusCoder-14B	14B text model based on Qwen3-14B.	🤗 Model
JanusCoderV-7B	7B multimodal model based on Qwen2.5-VL-7B.	🤗 Model
JanusCoderV-8B	8B multimodal model based on InternVL3.5-8B.	🤗 Model

📑 Data Synthesis Toolkit

We provide a versatile data synthesis toolkit that generates multimodal code data across heterogeneous domains—ranging from charts and Web UIs to visual artifacts and code-driven animations—while greatly reducing engineering efforts for large-scale corpus creation. 

Since the process of building JanusCode data involves a variety of synthesis pipelines, we provide a few examples here:

Example Workflows:

Extend, refine and derive new text-centric data for chart tasks

python data_synthesis/viscode_extend_synthesis_pipeline.py \
    --input raw_data/viscode \
    --output processed/viscode_extended
    --output processed/mathematica_extended

Extend and derive new text-centric data for visual editing tasks

python data_synthesis/viscode_edit_synthesis_pipeline.py \
    --input processed/viscode_extended \
    --output processed/viscode_edited
    --output processed/mathematica_extended

Build data for generating dynamic animations with Manim

python data_synthesis/recontext_manim_data.py \
    --input raw_data/manim \
    --output processed/manim_recontext
    --output processed/mathematica_extended

Extend scientific visualizations with Mathematica

python data_synthesis/mathematica_extend_synthesis_pipeline.py \
    --input raw_data/mathematica \
    --output processed/mathematica_extended

More scripts will be released soon.

Data Samples:

1. We provide text-centric data samples at this link.
2. We provide vision-centric data samples at this link.

🧪 Training

We primarily follow the official training pipelines provided. Users can directly refer to the linked repositories for detailed instructions on SFT.

Our Model	Upstream Base	Training Pipelines
🤗 JanusCoder-8B	Qwen/Qwen3-8B	Qwen3 GitHub
🤗 JanusCoder-14B	Qwen/Qwen3-14B	Qwen3 GitHub
🤗 JanusCoderV-7B	Qwen/Qwen2.5-VL-7B-Instruct	Qwen-VL GitHub
🤗 JanusCoderV-8B	OpenGVLab/InternVL3_5-8B	InternVL GitHub

We also provide some typical training configuration file for llamafactory users in training_files.

All our experiments were conducted on interconnected 8× H800 GPUs.

📏 Evaluation

We provide several ready-to-use scripts to quickly reproduce our experimental results. You can replace them with other scripts under the evaluation directory to evaluate different tasks, for example:

bash DesignBench/scripts/designbench_vllm-januscoderv.sh

bash evaluation/ArtifactBench/artifactbench-januscoder.sh

bash evaluation/InteractScience/interactscience-januscoderv.sh

For evaluations on LiveCodeBench-v6, MBPP+: We directly adopt the evaluation scripts provided by OpenCompass.

For evaluations on Artifactbench and Interactscience can be run the instructions in their original repositories. You can fork/clone the original repos to reuse their official environments and configs.

📚License

This project is licensed under the Apache 2.0 License. See the LICENSE file for details.

📋 Citation

🫶 If you are interested in our work or find the repository / checkpoints / benchmark / data helpful, please consider using the following citation format when referencing our papers:

@article{sun2025januscoder,
  title={JanusCoder: Towards a Foundational Visual-Programmatic Interface for Code Intelligence},
  author={Sun, Qiushi and Gong, Jingyang and Liu, Yang and Chen, Qiaosheng and Li, Lei and Chen, Kai and Guo, Qipeng and Kao, Ben and Yuan, Fei},
  journal={arXiv preprint arXiv:2510.23538},
  year={2025}
}

@article{sun2024survey,
  title={A survey of neural code intelligence: Paradigms, advances and beyond},
  author={Sun, Qiushi and Chen, Zhirui and Xu, Fangzhi and Cheng, Kanzhi and Ma, Chang and Yin, Zhangyue and Wang, Jianing and Han, Chengcheng and Zhu, Renyu and Yuan, Shuai and others},
  journal={arXiv preprint arXiv:2403.14734},
  year={2024}
}

@article{chen2025interactscience,
  title={InteractScience: Programmatic and Visually-Grounded Evaluation of Interactive Scientific Demonstration Code Generation},
  author={Chen, Qiaosheng and Liu, Yang and Li, Lei and Chen, Kai and Guo, Qipeng and Cheng, Gong and Yuan, Fei},
  journal={arXiv preprint arXiv:2510.09724},
  year={2025}
}

@article{sun2025codeevo,
  title={CodeEvo: Interaction-Driven Synthesis of Code-centric Data through Hybrid and Iterative Feedback},
  author={Sun, Qiushi and Gong, Jinyang and Li, Lei and Guo, Qipeng and Yuan, Fei},
  journal={arXiv preprint arXiv:2507.22080},
  year={2025}
}