OpenAI Will Watermark ChatGPT Outputs by Default — But Only in the EU

OpenAI has announced that ChatGPT outputs will be watermarked by default for users in the European Union, a compliance move tied to the EU AI Act's transparency requirements for AI-generated content. The watermarking applies to text and potentially other output types, embedding metadata signals to identify content as AI-generated. For developers building applications with ChatGPT APIs targeting EU users, this change may affect how outputs are processed, displayed, or stripped of metadata before delivery to end users. The EU-only scope raises questions about fragmented compliance strategies and whether similar requirements will eventually be applied globally. This is also a technically significant signal that content provenance tooling is moving from optional to mandatory in regulated markets.