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OpenAI will watermark ChatGPT text in the EU, and says 25% synonym swaps cut detection to 17%

OpenAI plans to add an invisible watermark to ChatGPT and Codex text in the European Union over the coming weeks. However, its own evaluation found that synonym swaps reduce detection: replacing 10% of words in a 400-token passage cut detection from about 92% to 66%, and 25% swaps cut it to 17%.

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OpenAI will watermark ChatGPT text in the EU, and says 25% synonym swaps cut detection to 17%

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