@article{rewardfreeevolvingagentsviapairwisevalid,
  title = {Reward-Free Evolving Agents via Pairwise Validator},
  author = {Minghao Liu and Yu Wang and Jiayun Wang and Wei Wei},
  year = {2026},
  eprint = {2607.14408},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.14408},
}