Popular AI leaderboard Arena nearly doubles valuation to $3.1B valuation in 10 months
AI leaderboard Arena raised $200 million at a $3.1 billion valuation.
Arena, the crowdsourced AI ranking platform that began at UC Berkeley in 2023, raised a $200 million Series B led by Lightspeed Venture Partners and Khosla Ventures at a $3.1 billion valuation. That nearly doubles its January Series A post-money valuation of $1.7 billion, when annualized revenue was $30 million; Arena said it reached $100 million ARR in June. It also added an alignment leaderboard covering unauthorized actions, false attribution, and deceptive task completion, where preliminary results place several OpenAI models ahead of Claude Opus 5.5 and Claude Fable.
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