@inproceedings{zhu-etal-2025-llm,
    title = "The {LLM} Already Knows: Estimating {LLM}-Perceived Question Difficulty via Hidden Representations",
    author = "Zhu, Yubo  and
      Liu, Dongrui  and
      Lin, Zecheng  and
      Tong, Wei  and
      Zhong, Sheng  and
      Shao, Jing",
    editor = "Christodoulopoulos, Christos  and
      Chakraborty, Tanmoy  and
      Rose, Carolyn  and
      Peng, Violet",
    booktitle = "Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing",
    month = nov,
    year = "2025",
    address = "Suzhou, China",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-emnlp/2025.emnlp-main.61/",
    pages = "1160--1176",
    ISBN = "979-8-89176-332-6"
}