AI Matters
Why it matters
OpenAI to watermark ChatGPT and Codex text in the EU
TechCrunch OpenAI will start watermarking ChatGPT’s text in the EU
OpenAI will add invisible watermarks to ChatGPT and Codex text in the EU to comply with the AI Act, and says editing can make them harder to detect.
Why it matters
If you use ChatGPT in the EU, its text will carry hidden marks that can flag it as AI-written, though editing the text can weaken them.
Latest brief · Oct 19, 2026