The Arena leaderboard, formerly the LMArena Chatbot Arena, ranks AI models using crowdsourced human preference votes. It began as a UC Berkeley research project in 2023 and became a company in 2025.
One profile cites a June 2026 company blog post describing an enterprise offering at a $100 million annualized run rate, which we have not verified directly. Arena raised a $200 million Series B in October 2026.