OpenAI will watermark ChatGPT and Codex text in the EU to comply with the AI Act

The company says invisible watermarks are coming to ChatGPT and Codex outputs in the EU, but warns that editing can make them harder to detect.

Key points

OpenAI will watermark ChatGPT and Codex text output in the EU to comply with the EU AI Act.
The watermarks are described as invisible marks embedded in generated text.
OpenAI warns that editing generated text can make the marks harder to detect.

Launch facts

Regions:: EU

1 source 0 web 55% confidence

Source highlights

TechCrunchPrimaryOpenAI will start watermarking ChatGPT’s text in the EU—80%

Full story and ongoing updatesRead full story

Story brief

The company says invisible watermarks are coming to ChatGPT and Codex outputs in the EU, but warns that editing can make them harder to detect.

Who should care

DevelopersAudit whether your EU-facing applications surface or store ChatGPT/Codex output, and plan for potential watermark-detection integration once OpenAI publishes detection tooling details.

Watermarking may require changes to how generated text is handled, displayed, or verified in downstream products.

FoundersAssess whether your product's reliance on AI-generated text in the EU creates new compliance or transparency obligations under the AI Act.

Regulatory provenance requirements could affect product design, user disclosures, and liability exposure.

PMsMap which user flows involve ChatGPT or Codex output in the EU and identify where watermark visibility or detection might matter to end users.

Product surfaces that present AI-generated content may need transparency labels or detection checks to align with regulatory expectations.

What changed

2026-10-05TechCrunch reports OpenAI will watermark ChatGPT and Codex text in the EU to comply with the AI Act.