Jiahe Guo 郭家合

Hello, I am a Ph.D. student at the Research Center for Social Computing and Information Retrieval (SCIR) at Harbin Institute of Technology (HIT), China. I am advised by Prof. Yanyan Zhao and Prof. Weixiang Zhao. My current research primarily focuses on the development and implementation of Socially Responsible AI, with particular attention to its applications in:

• Trustworthy LLM/Agent
• Reasoning Enhancement

I am currently a research intern in the Foundation Model Capabilities Department at JD.com, where I work on Agentic Mid-training and Post-training.

Selected Programs & Fellowships

• Tech Genius Team (TGT) Program, JD.com (京东顶尖青年技术天才计划（TGT项目）)
• 2026 Hunyuan Fellowship, CIE × Tencent (2026 混元学者 / 中国电子学会—腾讯 博士生科研激励计划混元专项)

Education

• Aug 2026 - Present. A Ph.D. student in SCIR, Department of Computer Science and Technology, Harbin Institute of Technology. Advisor: Prof. Yanyan Zhao.
• Sept 2025 - Jul 2026. A Master’s student in SCIR, Department of Computer Science and Technology, Harbin Institute of Technology. Advisor: Prof. Yanyan Zhao.
• Sept 2021 - Jul 2025. B.Sc. in the School of Future Technology, Harbin Institute of Technology.

Selected Publications

• ACL 2026 (Main, Top 0.7% OA of Submissions) Jiahe Guo, Xiangran Guo, Yulin Hu, Zimo Long, Xingyu Sui, Xuda Zhi, Yongbo Huang, Hao He, Weixiang Zhao, Yanyan Zhao, Bing Qin. When Personalization Legitimizes Risks: Uncovering Safety Vulnerabilities in Personalized Dialogue Agents [paper]

• 🏆 NeurIPS 2025 (🌟Spotlight - Top 3.2% of Submissions) Weixiang Zhao*, Jiahe Guo*, Yang Deng, Tongtong Wu, Wenxuan Zhang, Yulin Hu, Xingyu Sui, Yanyan Zhao, Wanxiang Che, Bing Qin, Tat-Seng Chua, Ting Liu. When Less Language is More: Language-Reasoning Disentanglement Makes LLMs Better Multilingual Reasoners. [paper]

• 🏆 EMNLP 2025 (Main, Oral) Weixiang Zhao*, Jiahe Guo*, Yulin Hu, Yang Deng, An Zhang, Xingyu Sui, Xinyang Han, Yanyan Zhao, Bing Qin, Tat-Seng Chua, Ting Liu. AdaSteer: Your Aligned LLM is Inherently an Adaptive Jailbreak Defender. [paper] [repo]

• AAAI 2026 Weixiang Zhao*, Xingyu Sui*, Jiahe Guo*, Yulin Hu*, Yang Deng, Yanyan Zhao, Bing Qin, Wanxiang Che, Tat-Seng Chua, Ting Liu. Trade-offs in Large Reasoning Models: An Empirical Analysis of Deliberative and Adaptive Reasoning over Foundational Capabilities. [paper] [repo]

• arXiv:2506.15647 Weixiang Zhao, Jiahe Guo, Yang Deng, Xingyu Sui, Yulin Hu, Yanyan Zhao, Wanxiang Che, Bing Qin, Tat-Seng Chua, Ting Liu. Exploring and Exploiting the Inherent Efficiency within Large Reasoning Models for Self-Guided Efficiency Enhancement. [paper]

• arXiv:2605.18104 Jiahe Guo, Xiangran Guo, Jiaxuan Chen, Weixiang Zhao, Yanyan Zhao, Yutai Hou, Qianchao Wang, Dandan Tu, Bing Qin. Safety Geometry Collapse in Multimodal LLMs and Adaptive Drift Correction. [paper]