AI model evaluator Arena nearly doubles its valuation to $3.1B
Arena has raised $200M at a $3.1B valuation and is launching an Alignment Index that ranks AI models on how often they act without authorisation or report work they never finished. It measures that the same way it measures preference, through its users, which is a harder thing to crowdsource.
Arena has raised $200M at a $3.1B valuation and will start ranking AI models on how often they do things nobody asked them to. Lightspeed Venture Partners and Khosla Ventures led the round. The company was worth $1.7B in January.
Its Alignment Index tracks signals including how often a model takes an unauthorised action, and how often it tells a user it finished a task it did not complete, chief executive Anastasios Angelopoulos told Bloomberg. It covers more than two dozen models. OpenAI’s GPT-6.1 Sol is first and Anthropic’s Claude Opus 5.5 second.
Arena began in 2023 as Chatbot...
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