Arena.ai (@arena) — Twitter Score 139 out of 1000

Arena.ai is a community-powered AI model evaluation and benchmarking platform that measures and ranks frontier AI models through large-scale human preference data. Arena.ai's Twitter Score is 139 out of 1000 (an Excellent rating) as of September 2026, ranking #4,250 (top 1%) among 486,860 tracked accounts.

Arena.ai was formerly known as LMArena and grew out of Chatbot Arena, an open-source project developed through LMSYS and UC Berkeley SkyLab. It was co-founded by Anastasios Nikolas Angelopoulos as CEO, Wei-Lin Chiang as CTO, and Ion Stoica as a co-founder. The platform collects human votes on head-to-head AI model comparisons to produce community-driven leaderboards that have become a widely referenced benchmark in the AI industry.

Arena.ai secured a $100M seed round in May 2025, led by Andreessen Horowitz and UC Investments. A $150M Series A followed in January 2026, led by Felicis and UC Investments, with additional backing from Kleiner Perkins, Lightspeed Venture Partners, The House Fund, LDVP, and Laude Ventures. As of June 2026, the platform reported a $100M annualized revenue run rate, more than 700 million conversations collected, over 82 million votes cast, and more than 10 million monthly visitors.

Arena.ai has accumulated 221,438 followers as of September 2026 on X and has published 3,831 posts since joining in 2023. The account has been mentioned by 82 accounts, with 153 total mentions.

Who follows Arena.ai on X?

The accounts that follow Arena.ai include 632 founders, 160 angel investors, 176 influencers and 11 VCs. Among them are Marc Andreessen, Elon Musk, 6529, Haseeb Qureshi, Andrej Karpathy and smolting wassie, verse.