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Screenshot of the OpenAI API dashboard, Project Settings, Text provenance tab: the Allow text watermarking switch is on, the Models menu reads All selected, and a Save button sits below.
Modelsstrong signal

OpenAI will watermark ChatGPT and Codex text in the EU, and API customers can opt in

OpenAI published its plan for text watermarking on October 5, 2026, in response to the EU AI Act. Over the coming weeks, eligible ChatGPT and Codex text output in the European Union will carry an invisible watermark called textGrain. In the API, watermarking is available worldwide from the same day for select models, and it stays off unless you turn it on. The detector is not public: OpenAI is limiting it to approved researchers and expert organizations.

OpenAIverified

Industrystrong signal

How to label AI content under Article 50, and which part of it is not your job

Article 50 of the EU AI Act has applied since August 2, 2026, and it binds anyone serving people in the Union, wherever the server is. Most of the panic is about the machine-readable marking requirement, which for a site owner who calls somebody else's API is somebody else's obligation. Here is what is actually yours: a chatbot that says what it is, published text that either carries a name or carries a label, and a deepfake that admits it.

Evropska komisijaverified

Industrymedium signal

Commission guidance sets out who must label AI content from August 2, 2026, and who need not

Article 50 of the European Union AI Act has applied since August 2, 2026. The duties are not the same for the party that supplies a system and the party that uses one in its own work, and the exceptions are explicit: law enforcement use, evidently artistic work, assistance with ordinary editing, and content for which a named person holds editorial responsibility.

Smashing Magazineverified