Checked fact 9199 Oct 2026Research

Arena says it is announcing a $200 million Series B at a $3.1 billion valuation, co-led by Lightspeed Venture Partners and Khosla Ventures.

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a $200 million Series B at a $3.1 billion valuation

What the source said when we opened it, on 9 Oct 2026.

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Measuring the AI Frontier for Real-World Alignment: Arena's $200 Million Series B
Arena · 2026-10-08

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Arena announces an Alignment Index preview with three agent-trace signals and a $200 million Series B. 9 Oct 2026

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The company says: “Arena says it is announcing a $200 million Series B at a $3.1 billion valuation, co-led by Lightspeed Venture Partners and Khosla Ventures.” ai notis, checked 9 Oct 2026. Source: Measuring the AI Frontier for Real-World Alignment: Arena's $200 Million Series B (Arena). https://ainotis.com/c/919

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ai notis. (2026, October 9). The company says: Arena says it is announcing a $200 million Series B at a $3.1 billion valuation, co-led by Lightspeed Venture Partners and Khosla Ventures [Checked claim 919]. ai notis. https://ainotis.com/c/919

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