@article{planbenchxlevaluatinglonghorizonplanning,
  title = {PlanBench-XL: Evaluating Long-Horizon Planning of LLM Tool-Use Agents in Large-Scale Tool Ecosystems},
  author = {Jiayu Liu and Qihan Lin and Cheng Qian and Rui Wang and Emre Can Acikgoz and Xiaocheng Yang and Jiateng Liu and Zhenhailong Wang and Xiusi Chen and Heng Ji and Dilek Hakkani-Tür},
  year = {2026},
  eprint = {2606.22388},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.22388},
}