Crowdsourced benchmark platform for AI models, born as a research project at UC Berkeley.
Founders
Anastasios Angelopoulos(United States · ♂)— A Berkeley EECS PhD focused on trustworthy AI and evaluation, he co-created Chatbot Arena as a side project under LMSYS in 2023 and spun it into LMArena in 2025 as CEO to build human-preference LLM evaluation infrastructure.
Wei-Lin Chiang(Taiwan · ♂)— A Berkeley EECS PhD who co-built Chatbot Arena under LMSYS in 2023, he co-founded LMArena in 2025 as CTO to scale open, head-to-head LLM evaluation.
Ion Stoica(Romania · ♂)— A Berkeley professor and serial founder (Databricks, Anyscale, Conviva) who advised the Chatbot Arena students, he co-founded LMArena in 2025 as an advisor/co-founder.
Team & hubs
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