§ Homepage — Hong Kong · 2026

Sixiang Chen 陈思翔

PhD · 2nd Year Now: Tencent Hunyuan Image · 青云计划 Agentic RL · Unified Models · Reward Modeling for Visual Generation and Understanding.

I'm a second-year Ph.D. student at HKUST@ROAS, advised by Prof. Lei Zhu and Prof. Fugee Tsung. My research centers on Multi-modal Agentic RL, Unified Models, and Reward Modeling — designing large-scale post-training recipes that align unified generation models with human preferences, and building agents that reason, retrieve, and self-evolve by interacting with real-world tools and visual experience.

I am currently a research intern at Tencent Hunyuan Image through the 青云计划 (Project Up), and previously at Meituan LongCat (Meigen-AI) through the 北斗计划 (Beidou). My research has long lived in visual generation — projects I lead, including GenEvolve, PosterCraft, PosterOmni, and PosterReward, turn agentic reasoning, unified modeling, and reward-driven post-training into dependable tools for designers, creators, and broader creative communities.
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01 § Industry

Industry Experience

Industrial research through top-tier talent programs, working on large-scale post-training, RL, and reward modeling for unified visual generation.

Active · Now May 2026 — Present

Tencent Hunyuan Image 青云计划 · Project Up

Research Intern · Hunyuan Image Group

Selected as a Project Up (青云计划) research intern at Tencent Hunyuan Image, working on next-generation foundation models for image generation — large-scale post-training, reinforcement learning, and reward modeling to push unified multi-task synthesis toward production-grade quality.

Post-training RL · Reward Unified Generation
Previously Apr 2025 — May 2026

Meituan LongCat (Meigen-AI) 北斗计划 · Beidou

Research Intern · Vision & Generation Group

Selected as a Beidou (北斗计划) research intern, led research on agentic visual generation, unified poster creation, and reward modeling — contributing to GenEvolve, PosterCraft, PosterOmni, and PosterReward, all open-sourced under MeiGen-AI.

Agentic Generation Unified Poster Reward Modeling

02 § Research

Research Interests

My work centers on large-scale post-training, RL, and reward modeling for unified multi-modal generation — and on agents that reach beyond a single model by interacting with real-world tools and visual experience.

Multi-modal Agentic RL

Building multi-modal agents that reason, act, and self-improve via reinforcement learning over unified models — orchestrating real-world tools, references, and visual experience for grounded decision making in long-horizon visual generation tasks.

GenEvolve arXiv'26 JarvisIR CVPR'25 RestoreAgent NeurIPS'24

Unified Models & Post-training

Designing unified frameworks that consolidate diverse multi-modal capabilities — local edits, global design, perception, and synthesis — into a single generalized model, and scaling them up through large-scale post-training recipes.

PosterOmni CVPR'26 PosterCraft ICLR'26

Reward Modeling

Discovering and designing reward models that align generative outputs with human aesthetic, functional, and reasoning standards — providing robust optimization signals for RL-based post-training of foundation models.

PosterReward CVPR'26 SnowMaster CVPR'25

Visual Generation & Understanding

Across diffusion priors, restoration, and perception, I study what a unified model can perceive, restore, and create — bringing visual generation and understanding closer together for real-world conditions.

DTPM CVPR'24 AGLLDiff AAAI'25 GenHaze ICCV'25 DAM CVPR'25

03 § News

News & Highlights

  • May 2026ReleaseReleased GenEvolve, a multi-modal agent that orchestrates search, visual references, and generation tools — and self-evolves through visual experience distillation. Co-developed at Meituan LongCat (Meigen-AI).
  • Feb 2026PaperPosterOmni accepted by CVPR 2026.
  • Feb 2026PaperPosterReward accepted by CVPR 2026.
  • Feb 2026ReleaseReleased PosterOmni — one model for poster creation, unifying local edits and global design for multi-task image/poster-to-poster generation. Your intelligent assistant for high-quality aesthetic poster creation.
  • Jan 2026PaperPosterCraft accepted by ICLR 2026.
  • Jun 2025ReleaseReleased PosterCraft, a unified framework for high-quality aesthetic poster generation. From your prompts to high-quality aesthetic posters.
  • Jun 2025PaperGenHaze accepted by ICCV 2025.
  • Apr 2025ReportOur comprehensive GPT-4o Image Generation Capabilities evaluation report is now available on arXiv.
  • Feb 2025PaperThree papers accepted by CVPR 2025.
  • Feb 2025RoleServing as a reviewer for NeurIPS 2025 and ICCV 2025.
  • Jan 2025RoleServing as a reviewer for IEEE TIP.
  • Dec 2024RoleServing as a reviewer for CVPR 2025 and ICML 2025.
  • Dec 2024PaperFour papers accepted by AAAI 2025.
  • Sept 2024PaperOne paper accepted by NeurIPS 2024.
  • Aug 2024RoleServing as a reviewer for ICLR 2025.
  • Jul 2024PaperTwo papers accepted by ECCV 2024.
  • Jun 2024PaperOne paper accepted by MICCAI 2024.
  • Jun 2024RoleServing as a reviewer for IEEE TITS and TCSVT.
  • May 2024RoleServing as a reviewer for NeurIPS 2024.
  • Apr 2024PaperOne paper accepted by CVPR 2024 as a Highlight.
  • Nov 2023PaperOne paper accepted by AAAI 2024.
  • Aug 2023PaperOne paper accepted by BMVC 2023.
  • Jul 2023PaperFour papers accepted by ACM MM 2023; two papers accepted by ICCV 2023.
  • Jul 2023RoleServing as a reviewer for IEEE TMM.
  • Jun 2023HonorAwarded Outstanding Graduate from Jimei University.
  • Feb 2023PaperTwo papers accepted by ICASSP 2023.
  • Sept 2022PaperOne paper accepted by ACCV 2022.
  • Jul 2022PaperOne paper accepted as an oral presentation by ECCV 2022.
  • Jun 2022PaperOne paper accepted by CVPRW 2022.

04 § Service & Awards

Academic Service & Awards

Program Committee · Reviewer

Conference on Computer Vision and Pattern Recognition (CVPR 2026)

International Conference on Learning Representations (ICLR 2026)

IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)

International Conference on Computer Vision (ICCV 2025)

Conference on Neural Information Processing Systems (NeurIPS 2025)

IEEE Transactions on Image Processing (TIP)

International Conference on Machine Learning (ICML 2025)

Conference on Computer Vision and Pattern Recognition (CVPR 2025)

International Conference on Learning Representations (ICLR 2025)

IEEE Transactions on Intelligent Transportation Systems (TITS)

Conference on Neural Information Processing Systems (NeurIPS 2024)

European Conference on Computer Vision (ECCV 2024)

IEEE Transactions on Circuits and Systems for Video Technology (TCSVT)

IEEE Transactions on Multimedia (TMM)

ACM Multimedia (ACM MM 2023 / 2024)

International Conference on Computer Vision (ICCV 2023)

International Conference on Robotics and Automation (ICRA 2023)

Asian Conference on Computer Vision (ACCV 2022)

Selected Awards

Third Place, NTIRE 2025 Challenge on Day and Night Raindrop Removal
CVPR Workshop · 2025
Fifth Place, NTIRE 2024 Challenge on Low Light Image Enhancement
CVPR Workshop · 2024
PG Scholarship of HKUST (Guangzhou)
2024
Outstanding Graduate, Jimei University
2023
International Third Prize (Team Leader), Mathematical Contest in Modeling
2022
National Second Prize (Team Leader), China Undergraduate Mathematical Contest in Modeling
2021
National Second Prize (Team Leader), Mathorcup Mathematical Contest in Modeling
2021

05 § Education

Education & Experience

  • Sept 2024 — PresentPh.D. Student, The Hong Kong University of Science and Technology (Guangzhou)
  • Aug 2023 — Aug 2024Research Assistant, The Hong Kong University of Science and Technology (Guangzhou)
  • Sept 2019 — Jun 2023B.Eng., Jimei University