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Announcement

Arena announces $200M Series B at $3.1B valuation and launches Alignment Index

Arena says its index draws on real-world agent traces, with results for over 20 frontier models at launch.

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3 Sources, 2h ago, first seen 2h ago

TLDR

Arena announced a $200 million Series B at a $3.1 billion valuation alongside its Alignment Index. The company says the index draws on real-world agent traces and launched with results for over 20 frontier models. Its initial signals are Unauthorized Action, False Attribution and Deceptive Completion. Arena says the funding will support more safety signals, agentic capabilities and modalities.

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46.1K

3 Sources, first seen 2h ago

214 likes25 comments51 saves27 reposts

Combined views

46.1K

3 Sources, first seen 2h ago

214 likes25 comments51 saves27 reposts

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3 Sources

Arena.ai@arenaToday, 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).2h
a16z@a16zRT @arena: Today, we're announcing our Series B: $200M at a $3.1B valuation, and the release of Arena's Alignment Index. AI is advancing f…2h
Techmeme@TechmemeArena, which develops the popular AI model leaderboard, raised $200M at a $3.1B valuation, up from $1.7B in January, and launches an Alignment Index (@rachelmetz / Bloomberg) (Visit Techmeme dot com for the link and full context!)2h
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    3 Sources

    Arena.ai@arenaToday, 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).2h
    a16z@a16zRT @arena: Today, we're announcing our Series B: $200M at a $3.1B valuation, and the release of Arena's Alignment Index. AI is advancing f…2h
    Techmeme@TechmemeArena, which develops the popular AI model leaderboard, raised $200M at a $3.1B valuation, up from $1.7B in January, and launches an Alignment Index (@rachelmetz / Bloomberg) (Visit Techmeme dot com for the link and full context!)2h
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    Today's Rank

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