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OpenAI Watermarks ChatGPT and Codex Text in EU to Meet AI Act Requirements

  • Policy & Regulation
  • Foundation Models

OpenAI is rolling out invisible watermarks on ChatGPT and Codex-generated text across the European Union, an early-stage compliance step to meet the continent's AI Act requirement that generative AI output be machine-readable marked. Starting October 5, 2026, API customers worldwide can enable the feature for select models, with the watermarking system—called textGrain—activated by default for EU users of ChatGPT and Codex over the coming weeks.

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