nuOct 6, 2026, 11:35

ChatGPT to invisibly watermark texts to identify them as AI-generated

OpenAI is introducing an invisible AI watermark called textGrain to comply with European regulations requiring AI-generated text to be identifiable. The watermark embeds a specific word-choice pattern that can be detected by specialized software, though the tool is currently limited to researchers due to ongoing accuracy challenges.

OpenAI is implementing an invisible digital watermark, known as textGrain, to label content generated by its AI models, including ChatGPT and Codex. This initiative aligns with the European Union's AI Act, which requires AI-produced texts to be identifiable. Unlike visual watermarks, textGrain functions by embedding a secret, detectable pattern of word choices within the text itself. Currently, the detection tool is restricted to select researchers and expert organizations because the technology is not yet foolproof and remains susceptible to errors.

The effectiveness of the watermark is limited, particularly in shorter texts or passages that have undergone human editing. OpenAI acknowledges that altering even a small percentage of words can significantly reduce the detection rate. Furthermore, the presence of a watermark only suggests AI involvement rather than confirming the exact extent of its use. Consequently, the tool is not currently available for general public use by educators or employers, as results remain unreliable and easily circumvented through manual revisions or alternative AI platforms.

Economy Technology Netherlands

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Based on reporting by nu. Translated and condensed by LocalHeadlines.

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