OpenAI adds invisible watermarks to ChatGPT and Codex text
On 6 October 2026, OpenAI announced that it will add invisible watermarks to ChatGPT and Codex text because of EU AI rules. The company says detection can fail for several reasons and is therefore not reliable.
Sources
- ChatGPT starts exposing writers using AI with invisible watermarks; OpenAI says its texts, codes can be traced; how to avoid detection - The Economic Timesm.economictimes.com · Oct 6, 2026
- OpenAI begins efforts to watermark text in ChatGPT. - GIGAZINEgigazine.net · Oct 6, 2026
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