Announcement
Arena launches AI agent Alignment Index and raises $200M at a $3.1B valuation
Arena says its index tracks unauthorized actions, false attribution and deceptive completion across 90,000-plus agent sessions and 27 models.
TLDR
Arena announced a $200 million Series B at a $3.1 billion valuation alongside its Alignment Index. The company says the benchmark draws on 90,000-plus real-world agent sessions across 27 models. Arena says GPT-6.1-Sol leads its rankings with a score of 87.9, and that about one in eight sessions with 20-plus messages contain an unauthorized action.
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