Arena, an AI leaderboard platform that began as a UC Berkeley research project in 2023, raised $200 million in a Series B round at a $3.1 billion valuation, the company announced on Thursday. This funding round follows Arena reaching $100 million in annualized run-rate revenue in June, marking a significant milestone less than three years after its inception.
The Series B round was led by Lightspeed Venture Partners and Khosla Ventures, with participation from Salesforce Ventures, 01 Advisors, Dell Technologies Capital, Endeavor Catalyst, a16z, Felicis, and others, according to techcrunch.com. Arena previously raised $150 million in a Series A round in January at a $1.7 billion valuation when its annualized revenue was $30 million. The company offers a crowdsourced platform where users submit prompts and rate AI models, attracting tens of millions of monthly visitors.
Arena launched its commercial product, AI Evaluations, in September 2025, providing detailed performance analytics for AI labs and enterprises based on community feedback. This service gained traction as AI labs began gaming traditional benchmarks, and enterprises sought more tailored evaluations for their specific needs. Arena’s growth reflects a broader industry shift toward more nuanced AI model assessment beyond standard benchmarks.
Arena’s valuation nearly doubled in about 10 months, reflecting rapid revenue growth and market demand for its services. The company’s next financial update is expected with its upcoming earnings report, which will provide further insight into its revenue trajectory and market position.
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