Monday, October 5, 2026
OpenAI starts EU text watermarks under the AI Act
On Oct. 5, 2026 OpenAI said API customers worldwide can opt in to textGrain text watermarking for select models, with the setting off by default. Over the coming weeks it will add an invisible watermark to eligible ChatGPT and Codex text in the European Union only, and it opened detector applications for approved researchers rather than the public. OpenAI said the EU AI Act requires machine-readable marking of generated text, and it is not making watermarking a global default at launch.
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