OpenAI is adding an invisible watermark to text generated by ChatGPT and programming agent Codex, making it easier for machines to identify that it was written by AI. Announced on Monday, the change will be mandatory in the EU, and is currently opt-in for API customers across the rest of the world.
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Large language models work by generating text one word at a time, determining what the next will be by looking at the ones that came before it. OpenAI’s new text watermarking system textGrain influences this by changing how AI models choose words, having them consider both preceding text and pseudorandom values determined by a secret key.
This leaves a statistical signal in the generated content, allowing AI detection machines to determine what these pseudorandom values are and establish whether the text is dependent upon them. If it is, then it is flagged as AI-generated.
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