Checked fact 160715 Oct 2026Research

The report says a watermark is declared when the sum exceeds the (1 - alpha) quantile of that distribution, so that under its stated assumptions the conditional false positive rate is alpha.

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The exact words it rests on

we declare a watermark when Sn exceeds this distribution's (1 - alpha) quantile. The conditional false positive rate is alpha under these assumptions

What the source said when we opened it, on 15 Oct 2026.

The source

textGrain: Entropy-Calibrated Watermarking for Language Model Text
OpenAI · 2026-10-05

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Checked

Checked by the notis newsroom on 15 Oct 2026, against the source above.

In the story

How text watermarks work and what EU Article 50 requires 15 Oct 2026

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“The report says a watermark is declared when the sum exceeds the (1 - alpha) quantile of that distribution, so that under its stated assumptions the conditional false positive rate is alpha.” ai notis, checked 15 Oct 2026. Source: textGrain: Entropy-Calibrated Watermarking for Language Model Text (OpenAI). https://ainotis.com/c/1607

As a reference (APA style)

ai notis. (2026, October 15). The report says a watermark is declared when the sum exceeds the (1 - alpha) quantile of that distribution, so that under its stated assumptions the conditional false positive rate is alpha [Checked claim 1607]. ai notis. https://ainotis.com/c/1607

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