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Arena 宣布 2 亿美元 B 轮融资并发布 Alignment Index
Arena 宣布完成 2 亿美元 B 轮融资，估值 31 亿美元，同时发布 Alignment Index。该指数基于真实 agent 轨迹，首批包含 Unauthorized Action、False Attribution、Deceptive Completion 三个信号，并公布 20 多个前沿模型的结果。公司称资金将用于安全信号、agent 能力和多模态方向，目前团队约 90 人。
AI推荐理由 Arena 官方账号宣布 2 亿美元 B 轮融资、估值 31 亿美元，并发布 Alignment Index，属官方首发信息，事实明确。但正文以融资和招聘宣传为主，Alignment Index 的具体方法、样本与结果细节有限，需结合后续帖子判断；互动量仅作传播信号，不折算为质量分。
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正文
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 real people. That's the role Arena is stepping into today.
The Alignment Index is built from real-world agent traces, starting with three signals: Unauthorized Action, False Attribution, and Deceptive Completion, with results for over 20 frontier models launching today.
Hear more from our CEO @ml_angelopoulos below, and read the full breakdown, and more details about our company growth in thread.
This funding will allow us to go further on safety signals, agentic capabilities, and modalities. It will also allow us to grow the company to match the scale of our mission. Today, we’re still a nimble team of 90, and we're looking for people to join us across research, product, engineering, and more. Come build with us.
As AI gets more capable and autonomous, understanding how well it can safely and effectively work for people only matters more. That's what Arena is built to measure and advance.
Thank you to our community, our investors, and everyone building with us!
Take a look at our open roles if you want to join us (link in bio).