@inproceedings{wu-etal-2026-llm,
    title = "{LLM} Prompt Duel Optimizer: Efficient Label-Free Prompt Optimization",
    author = "Wu, Yuanchen  and
      Verma, Saurabh  and
      Lee, Justin  and
      Xiong, Fangzhou  and
      Zhang, Poppy  and
      Awadelkarim, Amel  and
      Chen, Xu  and
      Yuan, Yubai  and
      Hill, Shawndra",
    editor = "Liakata, Maria  and
      Moreira, Viviane P.  and
      Zhang, Jiajun  and
      Jurgens, David",
    booktitle = "Findings of the {A}ssociation for {C}omputational {L}inguistics: {ACL} 2026",
    month = jul,
    year = "2026",
    address = "San Diego, California, United States",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-acl/2026.findings-acl.490/",
    pages = "10066--10089",
    ISBN = "979-8-89176-395-1"
}