OpenAI adds invisible watermarks to ChatGPT and Codex text in the EU
10/16/2026 — 10/16, 12:21·1 sources (all)·1 reports (all)
Key takeaways
- OpenAI said on October 5 that it will add invisible watermarks to ChatGPT and Codex text for EU users over the following weeks;
- elsewhere the feature stays off by default unless developers opt in. An accompanying guide explains who it covers and how the watermarking w…
Background & analysis
On October 5, 2026, OpenAI said it would add an invisible watermark to ChatGPT and Codex text for users in the European Union, with the rollout taking place over the following weeks. According to a DEV Community report published on October 16, the measure has applied by region since October 2026: users in the EU receive the watermark, while it stays off elsewhere unless a developer turns it on. The report says the guide covers who the watermark applies to, how it works, whether it can be detected or removed, and how OpenAI's approach compares with those of Claude and Gemini. Public information currently stops at this point: OpenAI has announced the EU rollout and the default-off status elsewhere, with no further developments reported.
AI-generated from 1 reports · updated 5 hours ago
Latest turnOn October 5, OpenAI said it will add an invisible watermark to ChatGPT and Codex text for users in the European Union, rolling out over the following weeks. Elsewhere the feature stays off unless a developer turns it on. The guide covers who gets it, how it works, whether it can be detected or removed, and how Claude and Gemini compare.
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On October 5, OpenAI said it will add an invisible watermark to ChatGPT and Codex text for users in the European Union, rolling out over the following weeks. Elsewhere the feature stays off unless a developer turns it on. The guide covers who gets it, how it works, whether it can be detected or removed, and how Claude and Gemini compare.
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