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Oct 8, 2026

Arena raises $200 million at $3.1 billion valuation in 10 months

Arena Intelligence, which runs a popular AI model leaderboard that crowdsources rankings, raised a $200 million Series B at a $3.1 billion valuation, nearly doubling its valuation from 10 months ago.

Oct 8, 2026·2 sources
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Top claims

  • ▪According to Bloomberg, Arena Intelligence Inc.'s preliminary Alignment Index ranks OpenAI's GPT-6.1 Sol first and Anthropic's Claude Opus 5.5 second; according to TechCrunch, Arena's preliminary alignment leaderboard ranks Claude Opus 5.5 sixth and Claude Fable ninth
  • ▪Arena Intelligence Inc. attracts tens of millions of visitors per month to its crowdsourced platform, according to co-founder and chief executive officer Anastasios Angelopoulos
  • ▪Arena Intelligence Inc. pulls its alignment data from user conversations with artificial intelligence models through Agent Arena, a platform designed for complex, multistep tasks

Topics

Chatbot ArenaAI research & benchmarksVenture capital fundingAI startups