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OpenAI is adding text watermarking to ChatGPT and Codex

Updated 2026-10-07 · told from many outlets at once

OpenAI is rolling out text watermarking in the EU for ChatGPT and Codex users, using textGrain to add invisible signals to text. The EU AI Act requires AI outputs to be machine-identifiable. Global API users can opt in to watermarked outputs, with access limited to researchers.

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Outlets: Dnevnik.bg, Estadão, NU.nl, TechCrunch, The Verge, de Volkskrant, www.theregister.com - Articles

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