NewOctober 5, 2026: OpenAI announces text watermarking for ChatGPT models. Learn more →

Clean AI Watermark

Guides

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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Does ChatGPT watermark text?

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.

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