OpenAI unveils TextGrain, an invisible watermark for AI-generated text

OpenAI announced TextGrain, a system that embeds a statistical watermark into text produced by its models. The mark is invisible to human readers but detectable by a dedicated scanner through subtle word-choice patterns.

• TextGrain weaves a statistical pattern into word choices during text generation
• The watermark is invisible to humans but detectable by a dedicated scanner
• Rewording a few phrases does not erase the mark, as it spans the whole text
• The system targets AI text detection in education, news and publishing