Hai-Long Sun | Ant Group

👀 About Me

I am currently with the Bailing Team at Ant Group. Prior to joining Ant Group, I received my M.Sc. degree from the School of Artificial Intelligence, Nanjing University, in 2026, under the supervision of Prof. Han-Jia Ye. During my graduate studies, I was a member of the LAMDA Group, led by Prof. Zhi-Hua Zhou.

Before that, I received my B.Sc. degree from the College of Computer Science & Technology, Nanjing University of Aeronautics and Astronautics, in June 2023 (GPA ranked 1 / 120). In the same year, I was admitted to the M.Sc. program at Nanjing University without entrance examination.

Beyond research, I am a National Level-II Tennis Athlete and former captain of both NUAA and NJU Tennis Teams.

Internship Opportunities

I am seeking highly self-motivated students for internships in multimodal foundation models. If interested, please email your resume and transcript to yimo.shl@antgroup.com.

📣 News

[2026-07] Our team released the Ling-3.0-flash model.
[2026-04] I joined the Bailing Team at Ant Group.
[2026-04] I was recognized as an Outstanding Graduate of Nanjing University.
[2026-03] Our survey was recognized as one of the Top-3 Most Influential IJCAI Papers.
[2025-10] I was awarded the National Scholarship for Graduate Students.
[2025-09] Two papers were accepted to NeurIPS 2025.
[2025-08] We released the multimodal LLM Ovis2.5-9B.
[2025-05] I was recognized as an ICLR 2025 Notable Reviewer.
[2025-05] One paper about visual forgetting of MLLMs was accepted to ACL 2025.
[2025-05] One paper about multilingual MLLMs (Parrot) was accepted to ICML 2025.
[2025-04] I joined Alibaba Token Hub · MaaS Team as a Multimodal Research Intern.
[2025-02] One paper about MLLM long-chain reasoning was accepted to CVPR 2025.
[2025-01] Our toolbox for class-incremental learning with PTMs (PILOT) was accepted to SCIS.
[2024-12] One paper about class-incremental learning was accepted to AAAI 2025.
[2024-11] We won the Grand Prize in the "Challenge Cup" – China Telecom Track.
[2024-10] I joined Tencent · TEG Hunyuan Research as a Research Intern.
[2024-07] We won the Championship at the SCICAP Challenge @ IJCAI'24.
[2024-06] One paper about multilingual MLLMs was uploaded to arXiv.
[2024-04] One survey about PTM-based continual learning was accepted to IJCAI 2024.
[2024-03] I joined Alibaba · AIDC-AI Business as an MLLM Research Intern.
[2024-02] One paper about class-incremental learning was accepted to CVPR 2024.
[2023-09] We released a toolbox for pre-trained model-based continual learning.

🌟 Research Interests

My research focuses on building capable and reliable learning systems, with an emphasis on multimodal foundation models and continual learning.

Multimodal Foundation Models Multimodal Agent and Coding Continual Learning

🚀 Selected Publications

Representative work in multimodal reasoning, multilingual MLLMs, and continual learning. My name is highlighted in bold.

Full publication list

ACL

Mitigating Visual Forgetting via Take-along Visual Conditioning for Multi-modal Long CoT Reasoning

Hai-Long Sun, Zhun Sun, Houwen Peng, Han-Jia Ye.

First Author

ACL'25. CCF-A

Paper Project Page Huggingface
ICML

Parrot: Multilingual Visual Instruction Tuning

Hai-Long Sun, Da-Wei Zhou, Yang Li, Shiyin Lu, Chao Yi, Qing-Guo Chen, Zhao Xu, Weihua Luo, Kaifu Zhang, De-Chuan Zhan, Han-Jia Ye.

First Author

ICML'25. CCF-A

Paper Code Project Page Huggingface
SCIS

PILOT: A Pre-Trained Model-Based Continual Learning Toolbox

Hai-Long Sun, Da-Wei Zhou, De-Chuan Zhan, Han-Jia Ye.

First Author

SCIS 2025. CCF-A

Paper Code 中文解读
AAAI

MOS: Model Surgery for Pre-Trained Model-Based Class-Incremental Learning

Hai-Long Sun, Da-Wei Zhou, Hanbin Zhao, Le Gan, De-Chuan Zhan, Han-Jia Ye.

First Author

AAAI'25. CCF-A

Paper Code
CVPR

Expandable Subspace Ensemble for Pre-Trained Model-Based Class-Incremental Learning

Da-Wei Zhou, Hai-Long Sun, Han-Jia Ye, De-Chuan Zhan.

Student First Author

CVPR'24. CCF-A

Paper Code
IJCAI

Continual Learning with Pre-Trained Models: A Survey

Da-Wei Zhou, Hai-Long Sun, Han-Jia Ye, De-Chuan Zhan.

Student First Author

IJCAI'24. CCF-A

Top-3 Most Influential IJCAI Papers
Paper Code 中文解读 Media
IJCAI

Length-Adaptive Caption Generation with LLMs

Hai-Long Sun, Qing-Guo Chen, Da-Wei Zhou, De-Chuan Zhan, Han-Jia Ye.

First Author

IJCAI'24 Workshop · SCICAP Challenge 2024
Paper Challenge Page

View additional publications

Technical Report

Ovis2.5 Technical Report

Ovis Contributors

Technical Report

Paper Code
Technical Report

VLMEvalKit: A Toolkit for Evaluating Large Vision-Language Models

VLMEvalKit Contributors

Technical Report

Paper Code
CVPR

Insight-V: Exploring Long-Chain Visual Reasoning with Multimodal Large Language Models

Yuhao Dong, Zuyan Liu, Hai-Long Sun, Jingkang Yang, Winston Hu, Yongming Rao, Ziwei Liu.

CVPR'25 (Highlight). CCF-A

Paper Code
NeurIPS

Triplets Better Than Pairs: Towards Stable and Effective Self-Play Fine-Tuning for LLMs

Yibo Wang, Hai-Long Sun, Guangda Huzhang, Qing-Guo Chen, Zhao Xu, Weihua Luo, Kaifu Zhang, Lijun Zhang

NeurIPS'25. CCF-A
Paper
NeurIPS

Multimodal Tabular Reasoning with Privileged Structured Information

Jun-Peng Jiang, Yu Xia, Hai-Long Sun, Shiyin Lu, Qing-Guo Chen, Weihua Luo, Kaifu Zhang, De-Chuan Zhan, Han-Jia Ye

NeurIPS'25. CCF-A
Paper

🏆 Awards & Honors

2025, National Scholarship for Graduate Students
2022, CCF Elite Collegiate Student Award (only 102 recipients nationwide)
2020/2022, National Scholarship for Undergraduates
2022, Grand Prize(全国唯一特等奖), China Collegiate Computing Contest - Network Technology Challenge in Track A
2022, Bronze Medal, ACM-ICPC Asia East Continent Final Contest
2020, Second Prize, The First China AI Guandan Algorithm Competition
2022, Gold Medal, Jiangsu Collegiate Programming Contest
2022, Meritorious Winner in MCM/ICM
2023, Outstanding Graduate of Nanjing University of Aeronautics and Astronautics
2023, 全国单打亚军、团体季军, 第26届全国大学生网球锦标赛总决赛
2024, 江苏省单打冠军、团体冠军, 2024年江苏省大学生网球锦标赛
2024, Champion, The Second Scientific Figure Captioning Challenge @IJCAI'24
2024, 特等奖, 挑战杯“揭榜挂帅”专项赛-中国电信赛道

👨‍💻 Experience

2026.03 — Present

Ant Group

Bailing Team

2025.04 — 2026.02

Alibaba Token Hub · MaaS Team

Multimodal Research Intern

2024.10 — 2025.04

Tencent · TEG

Hunyuan Research Intern

2024.03 — 2024.10

Alibaba · AIDC-AI Business

MLLM Research Intern

2022.08 — 2023.03

ByteDance

Data

🎯 Service

Conference Reviewer: CVPR'24, NeurIPS'24, ICLR'25🏆, CVPR'25, ICML'25, ICCV'25, NeurIPS'25, ICLR'26, CVPR'26
Teaching Assistant: Introduction to Machine Learning. (For undergraduate students; Autumn, 2023)

📮 Contact

For research discussions and internship applications, email is the best way to reach me.

yimo.shl@antgroup.com sunhl@lamda.nju.edu.cn