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Secret stamp: OpenAI adds invisible watermarks to ChatGPT text under EU rules

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Secret stamp: OpenAI adds invisible watermarks to ChatGPT text under EU rules

OpenAI will begin adding invisible watermarks to text generated by ChatGPT and Codex in the European Union. The rollout addresses transparency requirements under the EU AI Act.

The system embeds a hidden statistical signal into model-generated writing. Readers will not see the watermark, but OpenAI’s detector can analyze text for evidence of that signal.

The technology arrives as major AI companies face growing pressure to identify synthetic content. Anthropic announced a worldwide watermarking system for Claude text two months ago.

Some Claude users pushed back against that move. They argued that users provide the instructions, context and decisions while AI remains a tool.

OpenAI had also developed text watermarking before, but delayed its release. The company reportedly worried that users could move to competing services without similar restrictions.

OpenAI calls its system textGrain. It works by subtly changing statistical patterns in the words selected during generation. The company expects the watermark to reach eligible ChatGPT and Codex users across all EU plans over the coming weeks.

API customers worldwide will get a separate option. They can enable watermarked output for selected models, while the default setting remains off.

We're expanding our approach to content provenance to include text in response to EU regulatory requirements, while recognizing the significant limitations of current text watermarking technology.

Our tools already help verify whether an image or audio file was created with our…

OpenAI has also opened applications for its text watermark detector. Researchers and expert organizations will receive access initially.


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