I am a first-year Ph.D. student at The Chinese University of Hong Kong, Shenzhen, where I am fortunate to be co-advised by Prof. Pinjia He and Prof. Wenxuan Wang.

Before that, I conducted research with UCSB AI during my exchange study at the University of California, Santa Barbara, advised by Prof. Xin (Eric) Wang. I received my B.Eng. in Computer Science and Technology from Huazhong University of Science and Technology. I also interned at ByteDance, where I worked on an internal Web IDE for machine learning workflows.

My research interests lie in LLM agents, multimodal LLMs, and trustworthy AI.

I always welcome opportunities to collaborate and exchange ideas. If you are interested in my work or would like to discuss potential collaborations, please don’t hesitate to reach out!

📧 yichenguo1 [at] link [dot] cuhk [dot] edu [dot] cn
📧 yichenguo.hk [at] gmail [dot] com

Google Scholar / LinkedIn / GitHub

News

2026.09: WorldMemArena was accepted to the NeurIPS 2026 Evaluations and Datasets Track.
2026.09: Started my Ph.D. at CUHK-Shenzhen.
2026.08: HarnessAudit was accepted to COLM 2026 WAB.
2026.05: WorldMemArena is now available on arXiv.
2026.05: HarnessAudit is now available on arXiv.
2026.04: OmniTrace is now available on arXiv.

Publications & Preprints

WorldMemArena: Evaluating Multimodal Agent Memory Through Action–World Interaction

Agent Memory Multimodal Agents

Website arXiv OpenReview Code Dataset

NeurIPS 2026 Evaluations and Datasets Track

Featured by The Neuron

Chengzhi Liu, Yuzhe Yang, Sophia Xiao Pu, Yepeng Liu, Lin Long, Yichen Guo, Nuo Chen, Zhaotian Weng, Elena Kochkina, Simerjot Kaur, Charese Smiley, Xiaomo Liu, James Zou, Sheng Liu, Yuheng Bu, Songyou Peng, Xin Eric Wang.

Auditing Agent Harness Safety

Agent Safety Harness Auditing

Website arXiv OpenReview Code Dataset

COLM 2026 WAB

Featured by The Neuron and Synced (机器之心)

Chengzhi Liu*, Yichen Guo*, Yepeng Liu, Yuzhe Yang, Qianqi Yan, Xuandong Zhao, Wenyue Hua, Sheng Liu, Sharon Li, Yuheng Bu, Xin Eric Wang. (* Equal Contribution)

OmniTrace: A Unified Framework for Generation-Time Attribution in Omni-Modal LLMs

Generation-Time Attribution Omni-Modal LLMs

Website arXiv Code

arXiv preprint 2026

Qianqi Yan, Yichen Guo, Ching-Chen Kuo, Shan Jiang, Hang Yin, Yang Zhao, Xin Eric Wang.

Projects

AI-powered Full-stack PCB Defect Detection System

Code

An end-to-end PCB defect detection system integrating YOLOv9, Huawei ModelArts, a HarmonyOS app, backend services, board-side deployment, and NPU training.
Ranked #2 in the Huawei Cloud track and won the National Grand Prize in the 19th Challenge Cup.