About Me
I am currently a master’s student at Carnegie Mellon University in the Language Technologies Institute. I previously completed my undergraduate studies in Statistics at Zhejiang University. I have worked as a research intern at Alibaba Group, focusing on large-scale reinforcement learning to enhance the agentic search capabilities of LLMs.
Previously, I have worked with Prof. Arman Cohan and the YaleNLP group on LLM evaluations and information retrieval. I have also worked with Prof. Yang Yang on AI4Science (Foundation models for brain signal decoding).
🔥 News
- 2025.08: Joining CMU as a master student!
- 2025.07: Serving as a reviewer for EMNLP Demo Track.
- 2025.06: One Paper (Product-Searcher) submitted to EMNLP Industry Track!
- 2025.05: One Paper (Ref-long) accepted by ACL main!
- 2025.03: Joining Alibaba Group as a Research Intern!
- 2024.11: Present our work in-person at Miami, FL at EMNLP conference!
- 2024.10: New paper “TAIL: A Toolkit for Automatic and Realistic Long-Context Large Language Model Evaluation” has been accepted by EMNLP 2024 (Demo Track).
- 2024.07: Start as a visiting student at Yale University, working with Arman Cohan!
- 2024.01: Start my journey as an exchange student at HKUST!
📝 Publications

Product-Searcher: Real-World E-commerce Product DeepSearch via Reinforcement Learning
Gefei Gu*, Wenhui Chen, Qiankun Shi, WangZhenhai, Xuanzhou Liu, Weiqi Wang, Chenhao Ding, Guannan Zhang

Ref-Long: Benchmarking the Long-context Referencing Capability of Long-context Language Models
Junjie Wu*, Gefei Gu*, Yanan Zheng, Dit-Yan Yeung, Arman Cohan

TAIL: A Toolkit for Automatic and Realistic Long-Context Large Language Model Evaluation
Gefei Gu, Yilun Zhao, Ruoxi Ning, Yanan Zheng, Arman Cohan.
TAIL User Guide Feel free to use our toolkit!

BrainWave: A Brain Signal Foundation Model for Clinical Applications
Zhizhang Yuan, Fanqi Shen, Meng Li, Yuguo Yu, Gefei Gu, Fei Wu, Chenhao Tan, Yang Yang
🎖 Honors and Awards
- 2023.10 Outstanding Student, Zhejiang University
- 2023.10 First Prize Scholarship, Zhejiang University (Top 3%)
💻 Internships
- 2023.07 - 2023.08, Ping An Insurance (Group) Company of China, Ltd
- 2025.03 - 2025.07, Alibaba Inc.
🎹 Interesting Things!
- Besides study and research, I am interested in Photography and Trading.