OpenAI Introduces Text Watermarking to Comply with EU AI Act
OpenAI has unveiled its strategy for watermarking AI-generated text to meet requirements under the EU AI Act. The update introduces machine-readable traceability for content created via the company's API.

What happened?
OpenAI has announced its strategy for watermarking AI-generated text to comply with the transparency requirements of the EU AI Act. The company is introducing a new feature that makes text created via its API and models, such as ChatGPT and Codex, machine-readable and identifiable. The goal is to establish traceability and enable other systems to detect whether text content was generated by OpenAI's models.
Key facts
| Regelverk | EU AI Act transparensregler |
|---|---|
| Berörda produkter | OpenAI API, ChatGPT, Codex |
| Målgrupp | API-kunder globalt |
”The EU AI Act requires generative AI providers to make generated text identifiable in a machine-readable way.”
Why it matters
Provenance requirements are a core component of the EU AI Act's transparency rules, which came into force in August. By introducing text watermarking, AI companies like OpenAI are attempting to prevent disinformation and increase transparency regarding AI-generated material. At the same time, OpenAI acknowledges that text labeling is still an emerging technology with limitations, noting that minor edits can alter the watermark.
Who is affected?
The change primarily affects developers and companies globally that use OpenAI's API to build services and applications. End-users of ChatGPT and Codex are also affected, as generated text will now carry invisible or machine-readable markers. Companies operating within the EU are required to adapt their tools to the mandates of the EU AI Act.
Impact on the EU
The EU AI Act requires providers of generative AI to make AI-generated text identifiable in a machine-readable format. OpenAI is therefore rolling out the labeling for its API platform globally to meet these requirements, though the company emphasizes that the technology still has significant limitations regarding reliability and does not guarantee the origin or authorship of the content.
What else you should know
The technology behind text watermarking differs from image and audio labeling, as text is more easily manipulated through minor rewrites or translations. OpenAI stresses that the solution is not a tool for verifying facts or copyright, but solely a signal for machine-readable traceability.
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