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LMArena

AI · San Francisco, US · lmarena.ai

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.

Date	Round	Amount
Jan 2026	Series A LMArena raised a $150 million Series A at a $1.7 billion post-money valuation, led by Felicis and UC Investments, four months after its commercial launch.	$150M

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