OpenAI will start watermarking ChatGPT’s text in the EU

OpenAI says it will begin watermarking text generated by ChatGPT and Codex in the EU to comply with the AI Act. The company notes that subsequent editing can make the invisible marks harder to detect.

The move shows how AI providers are adapting product behavior to regional transparency requirements. It also highlights a key limitation of watermarking: provenance tools may weaken once generated content is modified or republished.