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OpenAI unveils text watermarking scheme in response to the EU AI Act

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OpenAI has announced its approach to meeting the EU AI Act's text provenance requirements. The core technology is textGrain: it adds invisible statistical signals to the model's word choices, and a detector then determines whether text carries an OpenAI watermark. API customers can voluntarily enable text watermarking for some models starting today, with it off by default. In the coming weeks, OpenAI will add invisible watermarks to eligible ChatGPT and Codex outputs in the EU and will open detector applications, initially limited to approved researchers and expert institutions. The watermark persists when text is copied and pasted. OpenAI says it does not identify users and that no significant change in model performance has been observed. OpenAI says that in internal testing, textGrain is comparable to or better than approaches like Google DeepMind's SynthID, and it has published a technical paper explaining the principles.

Generated by AI from reports · Updated 4 days ago

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Oct 7
  1. Ars Technica AI
    OpenAI will watermark ChatGPT outputs by default in the EU

    OpenAI announced it will automatically add watermarks to text generated by ChatGPT in the EU, while the feature is also available in other regions but off by default. The EU move is to comply with the EU AI Act, which takes effect in August and requires AI-generated content to be marked in a way detectable by other tools. OpenAI's watermarking method is proprietary, named textGrain, and it has published a technical paper explaining how it works. The approach is similar to other LLM watermarking tools: it embeds patterns in word choices that are imperceptible to human readers and do not noticeably affect output quality, and holders of the key can identify them with a dedicated detector. OpenAI says it will grant detector access to a limited number of researchers and institutions, with others able to join gradually through an application and approval process. The report also notes that existing standards such as SynthID and C2PA are relatively easy to bypass for people with basic knowledge.

Oct 6
  1. TechCrunch AISelected
    OpenAI will add watermarks to text generated by ChatGPT and Codex in the EU

    OpenAI announced it will add invisible watermarks to text generated by ChatGPT and Codex in the EU, to comply with the EU AI Act transparency rules that take effect on August 2. The watermark will roll out to eligible users across all plans in the EU in the coming weeks. Global API developers can enable it for some models starting today, with it off by default, and it will not be set as a global default for now. The watermark works by fine-tuning the model's word choices to form patterns recognizable by a detector, and it persists when text is copied and pasted. OpenAI says it does not identify users and that no significant change in model performance has been observed. OpenAI also published a technical report, textGrain, co-authored with researchers from the University of Pennsylvania and Yale, describing a method that uses a key to rank next-token predictions. Tests show that replacing 10% of words with synonyms reduces detection from about 92% to 66%, and that short texts, mathematical answers, and translated texts are harder to detect, so the detector will initially be available only to approved researchers and expert institutions.

  2. The Verge AI
    OpenAI adds text watermarking to ChatGPT and Codex, initially only for EU users

    OpenAI is adding invisible, machine-readable watermarks to text outputs from ChatGPT and Codex, initially only for EU users, rolling out to eligible users across all plans in the EU in the coming weeks, and not setting it as a global default for now. OpenAI says its textGrain watermark performs comparably to or better than approaches like Google DeepMind's SynthID in evaluations, and Anthropic's watermark announced in August is also based on SynthID; both aim to meet the requirements of the EU AI Act. API customers can opt in to watermarked outputs on some models starting today, and OpenAI also plans to offer the capability with cloud partners in the coming weeks. Approved researchers and expert institutions can apply to use the detection tool starting today, with initial approvals on a case-by-case basis. The tool only reports whether an OpenAI watermark is detected; it does not identify users or reveal prompts or conversations. OpenAI also cautions that textGrain does not guarantee reliable detection, and that the watermark cannot verify content accuracy, determine text authorship, measure the proportion of human contribution, or prove that text was written by a human.

  3. The Decoder
    OpenAI will add visible watermarks to ChatGPT text in the EU; API users can globally opt out

    To comply with the EU AI Act, OpenAI will enable invisible text watermarking for ChatGPT and Codex users in the EU in the coming weeks. The technology, named textGrain, works by embedding statistical signals in the model's word choices. Unlike Anthropic's mandatory watermarking for Claude globally, OpenAI's API watermarking is opt-in globally and will be available in the coming weeks through cloud partners such as Microsoft Azure. OpenAI says that in internal testing, textGrain matches or exceeds approaches like Google SynthID, and it plans to open-source the technology. Detection rates depend heavily on text length and topic: at a 1% false positive rate, detection for a 400-token psychology passage is about 95%, dropping to about 80% at 200 tokens, and significantly lower for mathematical content. Editing substantially weakens detection: replacing 10% of synonyms reduces detection for a 400-token passage from about 92% to 66%, and replacing a quarter drops it to 17%.

Oct 5
  1. OpenAISelected
    OpenAI unveils textGrain, its text watermarking approach for the EU AI Act

    OpenAI announced its plan to address the EU AI Act's text provenance requirements. The core technology is textGrain, which adds invisible statistical signals to the model's word choices, then uses a detector to determine whether text carries an OpenAI watermark. API customers can now voluntarily enable text watermarks for some models, with it being off by default. In the coming weeks, OpenAI will add invisible watermarks to eligible ChatGPT and Codex outputs in the EU and will open detector applications, initially limited to approved researchers and expert institutions. OpenAI said textGrain met or exceeded other approaches in evaluations, including SynthID for text, but detection is still affected by text length and rewriting: at a 1% target false-positive rate, detection rate is about 80% for 200-token passages and about 95% for 400-token passages, with notably lower results for math content; replacing 10% of synonyms in a 400-token passage drops detection from about 92% to 66%, and replacing 25% drops it to 17%.

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