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OpenAI to watermark text from ChatGPT and Codex in the EU

To comply with the EU AI Act, OpenAI will start watermarking eligible text from ChatGPT and Codex in the EU over the coming weeks, and API customers can enable text watermarking for select models worldwide.

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@OpenAIArchived 22 days agoOriginally posted 2026.10.06
OpenAI @OpenAIOriginally posted 2026.10.06
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We're expanding our approach to content provenance to include text in response to EU regulatory requirements, while recognizing the significant limitations of current text watermarking technology. Our tools already help verify whether an image or audio file was created with our models. This work builds on those efforts to help people better understand when content may have been generated or edited with an OpenAI model. In the EU, we’ll start watermarking eligible text from ChatGPT and Codex over the coming weeks to comply with the EU AI Act. Customers using our API can turn on text watermarking for select models worldwide today.

x.com/openai/status/2107164650249101695Archived 2026.10.06 10:31