OpenAI details new text watermarking system for ChatGPT, Codex, and the API

9to5mac.com Oct 5, 2026

OpenAI details new text watermarking system for ChatGPT, Codex, and the API

Curated by Shubham · TechCapsules · Oct 5, 2026

AI-summarised brief · reviewed before publication

OpenAI announced a new text watermarking system, textGrain, to comply with the EU AI Act. The invisible statistical signal will be added to ChatGPT and Codex outputs in the EU and to select API models globally, with opt‑in available. OpenAI also opened limited access to a detector for researchers, noting current false‑positive and false‑negative rates and limited effectiveness on short or heavily edited passages. The company plans to refine the technology and release it as open source.

💡 Why It Matters

· The rollout marks the first major AI provider to operationalize EU‑mandated transparency, setting a benchmark for industry compliance and influencing how future regulations may be enforced.

AI Capsules OpenAI

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