LMArena, an open community platform for evaluating the capabilities of AI models, announced on Wednesday that it has raised $100 million in seed funding led by Andreessen Horowitz (a16z) and the University of California (UC) investments. This values the project at $600 million, as reported by Bloomberg.  

The platform ranks models by allowing users to pose queries to two anonymous chatbots and voting for the best responses until they find a winner. Since its inception, the platform has completed over four hundred model evaluations, with more than 3 million votes cast by users. 

LM Arena also announced an update to its user interface and performance improvements across the platform. 

“This funding isn’t just about scaling infrastructure, it’s about supporting the community that makes LMArena possible,” said LMArena on X. “We’re doubling down on what matters: improving the diversity of our voters; more methodological research like style control and prompt-to-leaderboard; more modalities; more open data.” 

Previously known as Chatbot Arena, this initiative began as a research project by UC Berkeley students and researchers. 

“We invested in LMArena because the future of AI depends on reliability,” said Anjney Midha, general partner at a16z. “And reliability requires transparent, scientific, community-led evaluation. LMArena is building that backbone,” he added. 

The platform also provides a leaderboard of the best-performing AI models across various domains, including language, vision, web development, text-to-image, search, and more. 

Currently, the platform ranks Google’s Gemini 2.5 Pro first in the language category. Numerous AI companies globally highlight their models’ abilities by citing their scores on LMArena. 

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