
Which AI models watermark text?
Updated
Claude and Gemini mark their text with a word-choice watermark, and OpenAI is adding one to ChatGPT in the EU. See each model, the method, and who can check it.
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Novo5 de outubro de 2026: OpenAI anuncia marca d'água em textos do ChatGPT. Saiba mais →
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Updated
Claude and Gemini mark their text with a word-choice watermark, and OpenAI is adding one to ChatGPT in the EU. See each model, the method, and who can check it.

Updated
OpenAI is adding textGrain, a word-choice watermark, to ChatGPT text in the EU. It is not hidden characters. See how it works, who can detect it and its limits.