OpenAI will watermark ChatGPT outputs by default—but only in the EU
OpenAI announced it will automatically watermark text generated by ChatGPT in the European Union, a move driven by the EU AI Act. This feature, called textGrain, will be optional elsewhere. While existing watermarking standards like SynthID and C2PA are easily circumvented, OpenAI's proprietary method embeds undetectable patterns in word choices. OpenAI plans to provide detector access to select researchers and organizations, with a request-for-approval process for others.
This marks the first time OpenAI will implement automatic watermarking for ChatGPT outputs, unlike its optional approach in other regions.
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PublishedOffset at this time: UTC+0Oct 6, 2026, 20:50 UTC
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OpenAI will begin automatically watermarking text generated with ChatGPT in the European Union, the company has announced. It will also offer the watermarking feature in other regions, but it will be off by default outside of the EU.
The move in Europe is driven by a need to comply with the EU AI Act, which took effect in August. It requires marking content produced by AI models in a way that another tool can detect. Unfortunately, there is still no completely effective and reliable way to do that. A few standards already exist, like SynthID and the C2PA project, but they are relatively easy to circumvent for anyone with basic know-how.
The same is likely true for OpenAI’s watermark. Its method is proprietary; the company calls it textGrain, and has published a technical paper explaining how it works. But in general, it works like other LLM watermarking tools we’ve seen in the past: It puts patterns in the word choices that are not clear to a human reader and that don’t meaningfully change the general quality of the output, but that someone with a key can use a specialized detector to find. OpenAI says it will be giving access to the detector to a limited number of researchers and organizations and providing a request-for-approval process for others to be added over time.