Arena宣布完成2亿美元B轮融资，估值31亿美元，并推出Alignment Index

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• Arena宣布完成2亿美元B轮融资，估值31亿美元，并推出Alignment Index

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  Wei-Lin Chiang宣布Arena完成2亿美元B轮融资，估值达31亿美元，用于加速衡量和推进前沿智能的使命。同时推出Arena Alignment Index，在能力评估之外衡量智能体安全、可靠、忠实遵循人类意图的程度。

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  RT Wei-Lin Chiang We're excited to announce a major milestone for Arena: our $200M Series B at a $3.1B valuation, accelerating our mission to measure and advance frontier intelligence! At Arena, we believe AI evaluation must be grounded in real-world use. We put agents in live tool-use environments, challenge them with complex, long-horizon tasks, and analyze rich signals from millions of real-world user-agent interactions to understand how they perform. Today, we're also introducing the Arena Alignment Index, extending our evaluations beyond capability to measure how safely, reliably, and faithfully agents act in accordance with human intent. As AI systems become increasingly autonomous, evaluating what they can do is no longer enough. Understanding whether they reliably follow human intent, navigate uncertainty, and act safely in real-world environments is becoming one of the most important challenges in AI. We're excited to continue advancing the research and building the infrastructure needed to rigorously measure both capability and alignment at the frontier of AI. If you’re passionate about this mission, come build with us! Arena.ai: Today, we're announcing our Series B: $200M at a $3.1B valuation, and the release of Arena's Alignment Index. AI is advancing faster than our ability to evaluate it. The world needs a neutral third party to measure how safe and aligned AI actually is once it's in the hands of

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