@article{coincountingtheinvisiblereasoningtokens,
  title = {CoIn: Counting the Invisible Reasoning Tokens in Commercial Opaque LLM APIs},
  author = {Guoheng Sun and Ziyao Wang and Bowei Tian and Meng Liu and Zheyu Shen and Shwai He and Yexiao He and Wanghao Ye and Yiting Wang and Ang Li},
  year = {2025},
  eprint = {2505.13778},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2505.13778v1},
}