@article{opgrpoefficientoffpolicygrpoforflowmatch,
  title = {OP-GRPO: Efficient Off-Policy GRPO for Flow-Matching Models},
  author = {Liyu Zhang and Kehan Li and Tingrui Han and Tao Zhao and Yuxuan Sheng and Shibo He and Chao Li},
  year = {2026},
  eprint = {2604.04142},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2604.04142},
}