Arena Raises $200M Series B at $3.1B Valuation
San Francisco-based AI evaluation platform Arena has announced a $200 million Series B at a $3.1 billion valuation. Born from UC Berkeley's LMSYS research project, the company now tracks more than 1,000 open and closed models.
What happened
The round was led by Lightspeed and Khosla Ventures, with participation from a16z, Salesforce Ventures, and others. Arena also disclosed annualized revenue above $100 million.
Alongside the raise, Arena launched the Alignment Index, a new metric for how well AI systems align with human values and safety.
Key facts
- Raise and valuation:$200M Series B at a $3.1B post-money valuation.
- Investors:led by Lightspeed and Khosla Ventures, with a16z, Salesforce Ventures, and others participating.
- Business base:spun out of Berkeley's LMSYS project (the origin of Chatbot Arena); now tracks 1,000+ open and closed models with ARR above $100M.
- New product:the Alignment Index, measuring AI safety and alignment with human values.
Why it matters
Arena's annualized revenue has passed $100 million and it tracks more than 1,000 open and closed models; alongside the round it launched the Alignment Index to measure how well AI aligns with human values.
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