OpenAI adds invisible watermarks to ChatGPT and Codex text in the EU
In line with EU regulation, OpenAI is starting to watermark text generated by ChatGPT and Codex. Hungarian trade media (HWSW, Bitport, the National Cybersecurity Institute) also covered it, and Bitport calls it weak watermarking.
Who is affected and how
- tech lead
- Assess to what extent text and code generated with Codex and delivered to EU customers is affected by the watermarking.
- CTO
- The compliance policy should specify how AI-generated content is handled in the EU.
Sources
- OpenAI is adding invisible watermarks to ChatGPT and Codex text in the EUbleepingcomputer.com · Oct 5, 2026
- OpenAI is adding text watermarking in ChatGPT and Codexhowtechmoves.com · Oct 5, 2026
- OpenAI Rolls Out Invisible Text Watermarks in EU ChatGPT and Codex Under AI Act Rules | Organic Intelorganicintel.org · Oct 5, 2026
- OpenAI adds text watermarking to ChatGPT and Codex, starting with EU users | Zotpaperzot.news · Oct 5, 2026
- OpenAI Rolls Out textGrain Watermarking for ChatGPT and Codex in EU | AI News Feedainewsfeed.tech · Oct 5, 2026
- OpenAI says Codex and ChatGPT Work have 40M active usersruntimewire.com · Oct 7, 2026
- OpenAI rolls out text watermarking in ChatGPT and Codex in the EU | AI Agent Newsaiagentnews.org · Oct 7, 2026
- Run OpenAI Codex as an Agno agent with CodexAgent | Agnoagno.com · Oct 8, 2026
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