RESEARCH PAPERSubmitted 29 Oct 2025

π_RL: Online RL Fine-tuning for Flow-based Vision-Language-Action Models

Kang Chen; Zhihao Liu; Tonghe Zhang; Zhen Guo; Si Xu; Hao Lin; Hongzhi Zang; Xiang Li; Quanlu Zhang; Zhaofei Yu; Guoliang Fan; Tiejun Huang; Yu Wang; Chao Yu

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Major category: VLA
Quadrant: Not applicable
Architecture: Not applicable
Prediction paradigm: Not applicable
Subcategories: VLA post-training & data augmentation Diffusion & flow-matching VLA
Source review status: Verified from primary sources

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BibTeX

@article{pi_rl,
      title={{$\pi_\texttt{RL}$: Online RL Fine-tuning for Flow-based Vision-Language-Action Models}}, 
      author={Kang Chen and Zhihao Liu and Tonghe Zhang and Zhen Guo and Si Xu and Hao Lin and Hongzhi Zang and Xiang Li and Quanlu Zhang and Zhaofei Yu and Guoliang Fan and Tiejun Huang and Yu Wang and Chao Yu},
      year={2025},
      journal={arXiv:2510.25889},
}

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