Corroborated event · 5 outlets
OpenAI is adding an invisible, machine-readable watermark called textGrain to ChatGPT and Codex text in the EU to comply with the AI Act, while making it optional for API users worldwide.
AI brief
OpenAI will add a digital watermark to text and code generated in the EU to comply with the EU's new AI transparency rules.
Why it matters: The watermark is intended to meet new EU requirements for disclosing AI-generated content.
Written by AI from Engadget AI's published text. Read the original for full details.
More coverage of this story (4)
OpenAI outlines EU text watermarking approach for ChatGPT
OpenAI will start watermarking ChatGPT’s text in the EU
TechCrunch AI · 05 Oct 2026, 20:36
OpenAI is adding text watermarking in ChatGPT and Codex
The Verge AI · 05 Oct 2026, 18:08
OpenAI will watermark ChatGPT text in the EU but makes it optional for API users worldwide
The Decoder · 05 Oct 2026, 17:32
Our approach to EU text provenance rules
OpenAI News · 05 Oct 2026, 15:00
Primary source
Reporting from a publisher outside the organisation being covered.
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