@inproceedings{liu-etal-2026-planbench,
    title = "{P}lan{B}ench-{XL}: Evaluating Long-Horizon Planning of {LLM} Tool-Use Agents in Large-Scale Tool Ecosystems",
    author = {Liu, Jiayu  and
      Lin, Qihan  and
      Qian, Cheng  and
      Wang, Rui  and
      Acikgoz, Emre Can  and
      Yang, Xiaocheng  and
      Zong, Qing  and
      Liu, Jiateng  and
      Wang, Zhenhailong  and
      Chen, Xiusi  and
      Ji, Heng  and
      Hakkani-T{\"u}r, Dilek},
    editor = "Lee, Hung-Yi  and
      Dev, Sunipa  and
      Li, Jessy  and
      Elliott, Desmond",
    booktitle = "Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing",
    month = oct,
    year = "2026",
    address = "Budapest, Hungary",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2026.emnlp-main.385/",
    pages = "8804--8851",
    ISBN = "979-8-89176-459-0"
}