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OpenAI to add textGrain watermarks for EU ChatGPT and Codex

Aiden Reed October 5, 2026 AI Policy 0 Comments

News illustration: on a cool chalk-bone field, a white document card with the OpenAI blossom shows abstract gray text bars; a thin EU-blue provenance ribbon cuts the mid-page and reveals an ink-blue statistical grain-dot pattern; a floating green check detector glyph sits on the right edge; chips TEXTGRAIN and EU ONLY.

OpenAI will add invisible textGrain statistical watermarks to eligible ChatGPT and Codex text in the European Union in the coming weeks, open API opt-in watermarking…