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Arena raises $200M Series B at a $3.1B valuation

Arena, the AI model evaluation platform, says it raised a $200M Series B co-led by Lightspeed and Khosla Ventures at a $3.1B valuation. It reports annualized revenue above $100M, 350M sessions and 62M votes across its platform. It also launched an Arena Alignment Index covering 20+ frontier models.

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Primary source

Arenaarena.ai/blog/series-b

Coverage · 6 articles, oldest first

Thursday, October 8, 2026

  1. Bloomberg

    AI Model Evaluator Arena Valued at Over $3 Billion in Round

  2. Arena AI

    arena.ai/blog/series-b

  3. Arena AI

    arena.ai/blog/ai-alignment-index

  4. Unite.AI

    unite.ai/arena-secures-200m-series-b-at-3-1b-valuation-to-advance-ai-evaluation/

  5. Pulse 2.0

    pulse2.com/arena-raises-200-million-series-b-at-3-1-billion-valuation-to-evaluate-frontier-ai-models-and-agents/

  6. The Next Web

    thenextweb.com/news/arena-3bn-alignment-index-europe
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