OpenAI is adding invisible watermarks to ChatGPT and Codex text in the EU
OpenAI is adding invisible watermarks to text produced by ChatGPT and Codex in the European Union, BleepingComputer reported on October 5, 2026. According to the report, the watermarking covers text from both ChatGPT and Codex, and its geographic scope is the EU. The source does not specify how the invisible watermarks are implemented, whether they apply to all outputs or only some, when the change takes effect, or what regulatory or policy requirement prompted it. No details are given about detection methods, verification tools, or how users or developers would identify watermarked text. The report frames the change as an EU-specific measure affecting two named OpenAI products: ChatGPT and Codex. Beyond the product names, the region, and the fact that the watermarks are described as invisible, the source provides no further technical or procedural specifics. It does not state whether the watermarking is already live, planned, or being tested, nor does it name any EU law, authority, or deadline connected to the move. Because the excerpt is limited to the headline and a short opening fragment, the digest is restricted to those facts: invisible watermarks, ChatGPT and Codex text, and the EU as the stated scope.
Developers using ChatGPT or Codex in the EU may be working with text that OpenAI now watermarks invisibly, per the report.