About Me

I am Huatong Song (宋华彤), a second-year Master’s student at the Gaoling School of Artificial Intelligence (GSAI), Renmin University of China (RUC), supervised by Prof. Xin Zhao. Previously, I received dual Bachelor’s degrees from RUC in July 2025: a Bachelor of Engineering in Artificial Intelligence from the GSAI and a Bachelor’s degree in Finance from the Gaoli Institute.

My recent research focuses on AI Agents, particularly agentic post-training, including search agents, coding agents, and general agents, with the goal of improving their reasoning, tool-use, and long-horizon interaction capabilities. I am also particularly interested in training through complex agent harnesses and recursive self-improvement (RSI).

I am expected to graduate in June 2028. If you are interested in me, please feel free to contact me.

Experience

• 2026.09 – Now · ByteDance Seed Model-Product Posttrain-Work · LLM Research Intern ·
• 2026.04 – 2026.09 · IQuest Research · LLM Research Intern ·
• 2025.11 – 2026.04 · Boss Zhipin Nanbeige · LLM Research Intern ·
• 2025.05 – 2025.11 · ByteDance Seed-Edge · LLM Research Intern ·

Research

(* indicates equal contribution, † indicates corresponding author)

Company Technical Reports

• Nanbeige4.2-3B: Unlocking Agentic Capabilities in a Compact Model
  Nanbeige Lab, et al.
  Technical Report, 2026

• UI-TARS-2 Technical Report: Advancing GUI Agent with Multi-Turn Reinforcement Learning
  ByteDance Seed, et al.
  Technical Report, 2025

• Seed1.8 Model Card: Towards Generalized Real-World Agency
  ByteDance Seed, et al.
  Model Card / Technical Report, 2026

Selected Publications

Here, I list my work as a first or co-first author. For a complete list, please see my Google Scholar profile.

• ClawGym II: Exploring Black-Box RL on Agent Harness
  Huatong Song*, Fei Bai*, Ming Yang, Renyuan Li, Jia Deng, Jujie He, Zhange Zhang, Daixuan Cheng, Yan Xing, Qi Yun, Xuxing Chen, Danyang Li, Feng Chang, Chuan Hao, Ran Tao, Jian Yang, Bryan Dai, Wayne Xin Zhao†, Mingjie Tang†, Ji-Rong Wen
  Technical Report, 2026

• ClawGym: A Scalable Framework for Building Effective Claw Agents
  Fei Bai*, Huatong Song*, Shuang Sun*, Daixuan Cheng, Yike Yang, Chuan Hao, Renyuan Li, Feng Chang, Yuan Wei, Ran Tao, Bryan Dai, Jian Yang, Wayne Xin Zhao† ( Authors marked with * are ordered alphabetically )
  Technical Report, 2026

• SWE-Master: Unleashing the Potential of Software Engineering Agents via Post-Training
  Huatong Song*, Lisheng Huang*, Shuang Sun*, Jinhao Jiang*, Ran Le, Daixuan Cheng, Guoxin Chen, Yiwen Hu, Zongchao Chen, Wayne Xin Zhao†, Yang Song†, Tao Zhang, Ji-Rong Wen
  Technical Report, 2026

• SWE-World: Building Software Engineering Agents in Docker-Free Environments
  Shuang Sun*, Huatong Song*, Lisheng Huang*, Jinhao Jiang*, Ran Le, Zhihao Lv, Zongchao Chen, Yiwen Hu, Wenyang Luo, Wayne Xin Zhao†, Yang Song†, Hongteng Xu, Tao Zhang, Ji-Rong Wen
  Preprint, 2026

• R1-Searcher++: Incentivizing the Dynamic Knowledge Acquisition of LLMs via Reinforcement Learning
  Huatong Song*, Jinhao Jiang*, Wenqing Tian, Zhipeng Chen, Yuhuan Wu, Jiahao Zhao, Yingqian Min, Wayne Xin Zhao†, Lei Fang, Ji-Rong Wen
  EMNLP-Findings, 2025

• SimpleDeepSearcher: Deep Information Seeking via Web-Powered Reasoning Trajectory Synthesis
  Shuang Sun*, Huatong Song*, Yuhao Wang, Ruiyang Ren, Jinhao Jiang, Junjie Zhang, Fei Bai, Jia Deng, Wayne Xin Zhao†, Zheng Liu, Lei Fang, Zhongyuan Wang, Ji-Rong Wen
  EMNLP-Findings, 2025

• R1-Searcher: Incentivizing the Search Capability in LLMs via Reinforcement Learning
  Huatong Song*, Jinhao Jiang*, Yingqian Min, Jie Chen, Zhipeng Chen, Wayne Xin Zhao, Lei Fang, Ji-Rong Wen
  Technical Report, 2025

• Yulan-mini: An Open Data-Efficient Language Model
  Hu Yiwen*, Huatong Song*, Jie Chen, Jia Deng, Jiapeng Wang, Kun Zhou, Yutao Zhu, Jinhao Jiang, Zican Dong, Yang Lu, Xu Miao, Wayne Xin Zhao†, Ji-Rong Wen
  Technical Report, 2024

• YuLan-Mini: Pushing the Limits of Open Data-Efficient Language Model
  Hu Yiwen*, Huatong Song*, Jie Chen, Jia Deng, Jiapeng Wang, Kun Zhou, Yutao Zhu, Jinhao Jiang, Zican Dong, Yang Lu, Xu Miao, Wayne Xin Zhao†, Ji-Rong Wen
  ACL-Main-Oral, 2025

Awards

• 2026 Linghang Dean’s Scholarship, GSAI
• 2025 Outstanding Undergraduate Graduation Thesis (Top 5% of the GSAI)
• 2024 China National Scholarship (top 1.5%)
• 2024 Linghang Dean’s Scholarship, GSAI
• 2022 First-Class Academic Scholarship, RUC