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OpenAI will watermark ChatGPT text in the EU but makes it optional for API users worldwide

Technology · en

OpenAI will watermark ChatGPT text in the EU but makes it optional for API users worldwide

The Decoder · Oct 5, 2026, 5:32 PM UTC

OpenAI is adding invisible textGrain watermarks to ChatGPT in the EU, but unlike Anthropic, it will let API customers worldwide opt out. Tests show detection rates as high as 95 percent, dropping to 17 percent when a quarter of the words are replaced.…