signalTechCrunch AI2026-10-06
OpenAI will start watermarking ChatGPT’s text in the EU
OpenAI will add an invisible watermark to text generated by ChatGPT and Codex in the EU to comply with the EU AI Act, with rollout over the coming weeks. The watermark, called textGrain, subtly shapes word choices so a detector can identify AI-generated content, but it does not identify users and has no meaningful performance impact. OpenAI notes limitations: editing 10% of words with synonyms drops detection from about 92% to 66%, and a missing watermark does not prove human authorship.
- for who
- EU users of ChatGPT and Codex, and API developers who opt in to watermarking
- what changes
- Their AI-generated text in the EU will carry a detectable pattern that survives copy-paste, while API developers can enable it for select models now, off by default.
- to do
- Track the rollout in the coming weeks and review the textGrain technical report to understand detection reliability and limitations.
key points
- Watermark rolls out to EU ChatGPT and Codex users on all plans
- textGrain uses secret key to nudge word choices, detector spots pattern
- Editing 10% synonyms drops detection from 92% to 66%
#openai#text watermark#eu ai act#textgrain#ai regulation3 sources · confidence medium
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