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OpenAI is adding text watermarking in ChatGPT and Codex

The VergeView source article

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OpenAI to add text watermarking in ChatGPT and Codex for EU compliance

OpenAI announced it will add invisible textGrain watermarks to ChatGPT and Codex text in the EU to comply with the AI Act, with detection rates up to 95%, while making watermarking optional for API users worldwide.

Oct 5, 2026·3 sourcesAI coding assistantsAI content watermarking & provenanceAI assistants & chatbotsAI RegulationDeepfake detection & provenanceEuropean UnionOpenAIEU AI Act
OpenAI to add text watermarking in ChatGPT and Codex for EU compliance
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Other sources for this story

Techcrunch

OpenAI will start watermarking ChatGPT’s text in the EU

The Decoder

OpenAI will watermark ChatGPT text in the EU but makes it optional for API users worldwide