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Morning Edition · Tuesday, October 6, 2026Published at 2:03 AM EDT · New York
OpenAI begins watermarking ChatGPT and Codex text in the European Union to meet AI Act transparency rules
The textGrain signal reaches about 95% detection at 400 tokens under ideal conditions but falls to 17% when a quarter of the words are swapped for synonyms. API customers anywhere can opt in from October 5.
OpenAI said it will add an invisible watermark to text from ChatGPT and Codex for users in the European Union (EU). The system, called textGrain, embeds a statistical signal in word choice. Where several words fit equally well, a secret key…
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