OpenAI is adding invisible watermarks to ChatGPT and Codex text in the EU

Summary

OpenAI plans to add invisible watermarks to ChatGPT and Codex text in the European Union over the coming weeks, using its textGrain technology, which slightly changes word choices to create a detectable statistical pattern. API developers worldwide can opt in for supported models, but watermarking is disabled by default, and detector access is initially limited to approved researchers and expert organizations. OpenAI's tests show that replacing 25% of words with synonyms reduced detection from about 92% to 17% on 400-token passages.

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