Code & Chain · Signal Desk

OpenAI Launches Phased Text Watermarking Under EU AI Act, API First and Off by Default

Original sourceunite.ai

Summary

In response to the EU AI Act's transparency requirements, OpenAI introduced a phased text watermarking mechanism. Starting October 5, 2026, API outputs can optionally be watermarked globally, with the default off; in the coming weeks, eligible ChatGPT and Codex outputs in the EU will receive invisi…

Key points

  • This is a concrete case of generated content marking moving from voluntary initiatives to regulatory compliance, directly affecting how companies meet disclosure obligations.
  • Text watermarking becomes a practical means of AI Act transparency compliance; companies adopting generative AI need to reassess content marking and audit processes.
  • Companies providing AI-generated content in the EU may need to enable watermarking and retain verification records; developers should note the API default is off and must be actively opted in.

Editorial note

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