Checked fact 9149 Oct 2026Research

Arena says the Alignment Index preview starts with three signals it can verify against an actual agent trace with real human use: Unauthorized Action, False Attribution and Deceptive Completion.

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three measurable signals: Unauthorized Action, False Attribution, Deceptive Completion

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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Checked by the notis newsroom on 9 Oct 2026, against the source above.

In the story

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

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“Arena says the Alignment Index preview starts with three signals it can verify against an actual agent trace with real human use: Unauthorized Action, False Attribution and Deceptive Completion.” 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/914

As a reference (APA style)

ai notis. (2026, October 9). Arena says the Alignment Index preview starts with three signals it can verify against an actual agent trace with real human use: Unauthorized Action, False Attribution and Deceptive Completion [Checked claim 914]. ai notis. https://ainotis.com/c/914

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