OpenAI adds invisible watermarks to ChatGPT and Codex for users in the EU
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| Source: Digital Trends | Original article
OpenAI will embed invisible watermarks in ChatGPT and Codex outputs for EU users, though the system may have difficulty with edits and short text.
OpenAI announced that it will embed an invisible watermark in all text generated by ChatGPT and Codex for users located in the European Union. The move, detailed in a Monday blog post, is presented as a direct response to the EU AI Act’s new provenance rules, which require high‑risk AI systems to make it possible to trace the origin of their outputs.
The watermark is a subtle pattern woven into the model’s output that can be detected by OpenAI’s own tools, allowing regulators or third‑party auditors to confirm that a piece of text was produced by the company’s service. The rollout will begin in the coming weeks and will apply to every subscription tier that is eligible in the EU.
OpenAI cautions that the technique is not fool‑proof. The company notes that the watermark can be weakened or lost when the text is heavily edited, shortened, or otherwise transformed after generation. Those limitations mean that the signal may not survive all downstream uses, a point that could affect how reliably the watermark satisfies the Act’s transparency obligations.
The development builds on OpenAI’s earlier announcement that it would add a digital watermark to text and code in the EU, reported on 6 October. By moving from a “digital” to an “invisible” marker, the firm aims to make provenance checks less intrusive for end‑users while still meeting regulatory demands.
What to watch next is whether detection tools can keep pace with the watermark’s known weaknesses, and how regulators will evaluate compliance in practice. Observers will also be keen to see if OpenAI extends the approach beyond Europe or refines the technology to survive more aggressive editing, a step that could set a de‑facto standard for AI transparency worldwide.
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