Arena

Our Take

Arena is basically the scoreboard the AI world actually pays attention to — it's run by LMSYS (the folks behind that massive Chatbot Arena crowdsourcing thing) and they're putting Gemma 4 at the top of the US open-source pile. Look, leaderboards are always debatable, but this one carries more weight than most because it leans on real human comparisons rather than just synthetic benchmarks. If you're tracking what's actually performing in the wild, this is the reference point.

Key Facts

The people behind Arena

A

Anastasios Angelopoulos

profile

Co-founder / CEO

Co-founder and CEO of Arena (LMSYS). Ph.D. student at UC Berkeley (EECS), advised by Michael I. Jordan and Jitendra Malik. Previously postdoctoral scholar at UC Berkeley working with Ion Stoica.

L

Lianmin Zheng

profile

Key contributor

Key contributor at LMSYS / Arena. Ph.D. at UC Berkeley (advised by Ion Stoica and Joseph E. Gonzalez). Now member of technical staff at xAI, leading inference team.

W

Wei-Lin Chiang

profile

Co-founder

Co-founder of Arena (LMSYS), PhD student at UC Berkeley SkyLab. Works with Prof. Ion Stoica. Focus: building evaluation systems for AI, Chatbot Arena project.

GitHub