Created by UC Berkeley researchers, Arena (formerly LMArena) operates a community-powered AI evaluation platform where millions of builders compare frontier models and vote on their responses, producing public leaderboards grounded in real-world use. Formed as Arena Intelligence Inc. in 2025, the company sells AI Evaluations, an enterprise analytics product for AI labs, and publishes the Arena Alignment Index measuring agent safety in real-world tasks. It is headquartered in San Francisco and has surpassed $100 million in annualized revenue.
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Oct 8, 2026
Latest raise
Funding activity · 1 round
Oct 8, 2026
$200M
Series B
Led by Lightspeed Venture Partners
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