Arena Raises $200 Million Series B at $3.1 Billion Valuation to Expand AI Model Evaluation

The company behind the most widely trusted AI model leaderboard has nearly doubled its valuation in less than a year, raising $200 million to expand from pure performance ranking into evaluating AI safety and alignment. Arena, the crowdsourced evaluation platform founded by UC Berkeley researchers in 2023, announced the Series B funding round led by Lightspeed Venture Partners and Khosla Ventures, with participation from Salesforce Ventures, 01 Advisors, and Dell Technologies Capital. The $3.1 billion valuation represents a dramatic acceleration from the company's $1.7 billion Series A valuation just nine months earlier in January 2026, reflecting investor confidence in the platform's central role in the rapidly evolving AI industry.