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 watermark text generated by ChatGPT and Codex in the EU to comply with the AI Act, and says editing can make the invisible marks harder to detect.
Why it matters: It is a step toward meeting EU AI Act requirements for labeling AI-generated text.
Written by AI from TechCrunch 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 add a digital watermark to text and code generated in the EU
Engadget AI · 05 Oct 2026, 18:30
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
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