# Wei-Lin Chiang

> Wei-Lin Chiang is the co-founder and CTO of Arena, formerly LMArena. Trained at National Taiwan University and UC Berkeley, he helped create Chatbot Arena, a public platform that ranks AI models from people's votes on anonymous head-to-head responses.

- **Role:** Co-founder and CTO at Arena (formerly LMArena)
- **Organizations:** Arena, University of California, Berkeley Sky Computing Lab, LMSYS, National Taiwan University
- **Education:** B.S. in Computer Science, minor in Mathematics, National Taiwan University, M.S. in Computer Science, National Taiwan University, Ph.D. in Electrical Engineering and Computer Sciences, University of California, Berkeley
- **Known for:** Co-created Chatbot Arena, an open platform for ranking language models through crowdsourced human preference votes., Co-authored research on Chatbot Arena, MT-Bench, benchmark contamination, FastChat and Vicuna., Co-authored a 2018 ACML best-paper award winner and a 2024 NSDI outstanding-paper award winner.

## Career timeline

- **2016–2019** — Research and engineering internships at Microsoft, Microsoft Research Asia, Alibaba and Google Research.
- **2021** — Interned at Amazon in Seattle while pursuing Berkeley doctoral research.
- **2023** — Co-authored the launch of Chatbot Arena and contributed to Vicuna and FastChat.
- **2024** — Co-authored the Chatbot Arena technical paper and helped extend evaluation to images and other tasks.
- **2025** — Co-founded LMArena with Anastasios Angelopoulos and became CTO; the company announced $100 million in seed funding.
- **2026** — LMArena adopted the name Arena; the company reported more than 10 million monthly visitors in June.

## Achievements

- Co-created Chatbot Arena, an open platform for ranking language models through crowdsourced human preference votes.
- Co-authored research on Chatbot Arena, MT-Bench, benchmark contamination, FastChat and Vicuna.
- Co-authored a 2018 ACML best-paper award winner and a 2024 NSDI outstanding-paper award winner.
- Helped scale the research project into Arena, which reported 82 million cumulative votes by June 2026.

## Latest updates

- **2026-06** — Arena reported more than 10 million monthly visitors, 700 million cumulative conversations and 82 million cumulative votes.
- **2026-03** — Chiang and Angelopoulos discussed the neutrality of Arena's benchmark and expansion beyond chat on TechCrunch's Equity podcast.
- **2026-01** — Chiang shared the company's change of name from LMArena to Arena.

## Links

- Website: https://infwinston.github.io/
- LinkedIn: https://www.linkedin.com/in/wei-lin-chiang-51b025b2/
- Twitter/X: https://x.com/infwinston
- GitHub: https://github.com/infwinston

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Profile page: https://yespress.io/wei-lin-chiang
Published by YesPress — https://yespress.io
Last updated: 2026-09-29