It measures how AI models and agents perform on real tasks by collecting sessions and votes from users, then publishes leaderboards such as Agent Arena.

How much is Arena valued at?

$3.1 billion, according to its Series B announcement of 8 October 2026.

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AI evaluation company

Arena

Arena, run by Arena Intelligence Inc., is an AI evaluation platform that started as a research experiment. It ranks AI models and agents on public leaderboards built from real user sessions and votes, including Agent Arena. In October 2026 it raised a $200 million Series B at a $3.1 billion valuation and launched the Arena Alignment Index.

Last reviewed 28 Oct 2026

Facts at a glance

Type	AI model and agent evaluation platform
Latest round	$200 million Series B at a $3.1 billion valuation, 8 October 2026 source
Lead investors	Lightspeed Venture Partners and Khosla Ventures (co-leads) source
Revenue	More than $100 million in annualized revenue, Arena says source
Platform usage	350 million sessions and 62 million votes across the platform source
Previous round	Series A in January 2026 source

Questions people ask

What does Arena do?: It measures how AI models and agents perform on real tasks by collecting sessions and votes from users, then publishes leaderboards such as Agent Arena.
How much is Arena valued at?: $3.1 billion, according to its Series B announcement of 8 October 2026.