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AI · Policy · OpenAIGlobalOct 5, 2026

OpenAI starts invisible watermarking of ChatGPT text in the EU.

To meet EU AI Act provenance rules, OpenAI will add an invisible statistical watermark to eligible ChatGPT and Codex text in the EU, while API watermarking stays opt-in. The detector is restricted to approved researchers, and heavy rewording sharply reduces detection.

Why it matters

AI-written copy for European audiences may now carry machine-readable provenance signals.

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