Jizhou Guo

Jizhou Guo

Xiaohongshu (RedNote) Dots Studio

I am currently a researcher at Xiaohongshu (RedNote) Dots Studio through the REDstar Talent Program, working on large language model foundation systems. During my undergraduate studies at SJTU Zhiyuan College (Honors Program, Top 10%), I was fortunate to collaborate with and be mentored by Prof. Philip S. Yu, Prof. Bingsheng He, Prof. Shuai Li, Prof. Bao-Liang Lu, and Prof. Wei-Long Zheng.

My research has appeared at KDD, EMNLP (main), NeurIPS, and ICLR (Oral). I serve as a reviewer for ICLR 2026 and NeurIPS 2026. I am also a competitive programmer with multiple Gold Medals in ICPC and CCPC, mentored by Prof. Yong Yu.

Feel free to reach out if you’d like to chat!

Email / LinkedIn / WeChat / QQ / Xiaohongshu (RedNote) / CV

🔥 News

📝 Selected Publications

* denotes equal contribution

KDD 2026
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Mining Intrinsic Rewards from LLM Hidden States for Efficient Best-of-N Sampling

Jizhou Guo, Zhaomin Wu, Hanchen Yang, Philip S. Yu

KDD 2026

[arXiv] [code] [HF Daily] [AI Era (新智元)]

Proposed SWIFT, a lightweight reward model based on the LLM hidden states, which systematically outperforms baselines with less than 0.005% of the parameters of baselines.

EMNLP 2025 main
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Model-based Large Language Model Customization as Service

Zhaomin Wu*, Jizhou Guo*, Junyi Hou, Bingsheng He, Lixin Fan, Qiang Yang

EMNLP 2025 main

[arXiv] [code]

Proposed Llamdex, a novel framework that facilitates LLM customization as a service for domain-specific applications. It boosted accuracy by up to 26% while preserving privacy.

arXiv 2026
HAS-Bench framework and evaluation overview

HAS-Bench: Evaluating LLM-Based Human-Agent Systems under Configurable Human Participation

Yaozu Wu*, Wei-Chieh Huang*, Jizhou Guo*, Dongyuan Li, Renhe Jiang, Henry Peng Zou, Chunyu Miao, Shanghao Li, Weizhi Zhang, WeiWei Ye, Yankai Chen, Meng Zhang, Xue Liu, Philip S. Yu

arXiv preprint, 2026

[arXiv]

Introduces HAS-Framework and HAS-Bench for evaluating LLM-based human-agent systems under configurable human participation, covering both task outcomes and process-level collaboration behavior across six domains.

arXiv
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PSG-Agent: Personality-Aware Safety Guardrail for LLM-based Agents

Yaozu Wu*, Jizhou Guo*, Dongyuan Li*, Henry Peng Zou, Wei-Chieh Huang, Yankai Chen, Zhen Wang, Weizhi Zhang, Yangning Li, Meng Zhang, Renhe Jiang, Philip S. Yu

Under review

[arXiv]

Introduces PSG-Agent, a training-free system that provides personalized safety guardrails for LLM-based agents.

ICLR 2026 Oral
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LLM DNA: Tracing Model Evolution via Functional Representations

Zhaomin Wu, Haodong Zhao, Ziyang Wang, Jizhou Guo, Qian Wang, Bingsheng He

ICLR 2026 Oral (Top 1%)

[arXiv]

Introduced LLM DNA, a mathematically grounded, low-dimensional functional representation for LLMs. We developed RepTrace, a training-free pipeline that extracts DNA signatures to trace the evolutionary lineage of 305+ models.

NeurIPS 2024
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Calibrating Reasoning in Language Models with Internal Consistency

Zhihui Xie, Jizhou Guo, Tong Yu, Shuai Li

NeurIPS 2024

[arXiv] [poster] [code]

Proposed “internal consistency” approach to calibrate reasoning in LLMs, resulting in a significant boost in reasoning performance without requiring additional training.

🌍 Services

Invited as reviewer: ICLR 2026, NeurIPS 2026, EMBC 2025, AI4MATH @ ICML 2025

🎖 Selected Honors and Awards

Click here to view all certificates

  • 2025.12 Zhiyuan Honors Scholarship.
  • 2025.12 Academic Excellence Scholarship, SJTU (Top 10%, ranked 2nd overall).
  • 2025.10 Zhiyuan Overseas Research Scholarship.
  • 2025.09 Merit Student of SJTU.
  • 2025.01 Gold Award🥇 and First Runner-up in the National College Students’ Career Planning Contest (Shanghai Region).
  • 2024.12 Zhiyuan Honors Scholarship.
  • 2024.11 Zhiyuan First-Class Overseas Research Scholarship.
  • 2024.09 Merit Student of SJTU.
  • 2023.12 Academic Excellence Scholarship, SJTU (Top 10%, ranked 2nd overall).
  • 2023.12 Zhiyuan Honors Scholarship.
  • 2023.12 Third Prize in Mathematics competition of Chinese College Students (Shanghai).
  • 2023.09 First Prize in Shanghai Collegiate Programming Contest (Ranked 2nd in Shanghai).
  • 2023.08 Gold Award🥇 in Astar Programming Contest (Shanghai Region) (Ranked 2nd in Shanghai).
  • 2023.05 Gold Medal🥇 in 2023 China Collegiate Programming Contest (CCPC) National Invitational Contest (Hunan).
  • 2023.05 Gold Medal🥇 in 2023 International Collegiate Programming Contest (ICPC) Xi’an Invitational Contest.
  • 2022.12 Zhiyuan Honors Scholarship.
  • 2022.12 Gold Medal🥇 in 2022 International Collegiate Programming Contest (ICPC) Asia Hangzhou Regional Contest (Ranked 8th nationwide).
  • 2022.09 Gold Medal🥇 in 2022 China Collegiate Programming Contest (CCPC) (Shanghai region).
  • 2021.07 Silver Medal🥈 in National Olympiad in Informatics (NOI).
  • 2021.03 Ranked 22nd nationwide in National Olympiad in Informatics (NOI) Online Senior Group.

🌈 Miscellaneous

Apart from academic studies and research, I have a wide range of interests, including piano and singing.

  • I enjoy playing the piano🎹 and have passed ABRSM Practical Grade 8 and CCM Amateur Grade 10, both the highest levels. I’ve also won awards in several piano competitions.
  • I am passionate about singing🎤 and have passed CCM Amateur Grade 9 (highest level).
  • I used to serve as the conductor of the choir in junior high school.
  • I also have some experience in public speaking🗣️ and won Gold Award🥇 in the National College Students’ Career Planning Contest (Shanghai Region).
  • Regarding sports, I’m an amateur enthusiast of jogging🏃 and skiing⛷️.
  • I have participated in various algorithm competitions🖥️ and earned Gold Medals🥇 in ICPC/CCPC and a Silver Medal🥈 in NOI.