OpenAI 在欧盟为 ChatGPT 和 Codex 文本加入 textGrain 隐藏水印

原文标题：OpenAI is adding an invisible “textGrain” watermark to ChefGPT and Codex in the EU

AI 导读

OpenAI 表示欧盟符合条件的 ChatGPT 和 Codex 文本将携带名为 textGrain 的隐藏水印，未来几周内面向所有套餐推出，目前仅限欧盟。该水印是词选择上的统计模式而非可见标签，OpenAI 称其不识别用户、账号或提示词，检测器不公开，仅获批研究人员可申请使用。

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Yesterday OpenAI said eligible ChatGPT and Codex text in the EU will carry a hidden watermark called textGrain, rolling out over the coming weeks on every plan. It's EU-only for now. API customers anywhere can turn it on, but it's off by default there.

It's a statistical pattern in word choice, not a visible label. OpenAI says it doesn't identify you, your account or your prompt. The detector isn't public; only approved researchers can apply for access.

Editing weakens it a lot. In OpenAI's own test on 400-token passages, swapping 10% of words for synonyms cut detection from about 92% to 66%, and swapping 25% cut it to 17%.

OpenAI doesn't say whether code is watermarked.

Anyone in the EU noticed this yet?