OpenAI Expands Text Provenance in the EU as AI Act Rules Drive New Watermarking Tools

OpenAI is extending its content provenance work to AI-generated text in the European Union, positioning the move as part of its response to the EU AI Act. The company is taking a phased approach: eligible API customers worldwide can opt in to text watermarking for select models, while watermarking for eligible ChatGPT and Codex outputs is planned for the EU in the coming weeks. The key qualification is equally important. OpenAI says text watermarking remains an early technology, not conclusive evidence of who wrote a piece of content or whether a human was involved. The October 5, 2026 update