OpenAI 将在欧盟为 ChatGPT 文本加水印，API 用户可选
原标题：OpenAI will watermark ChatGPT text in the EU but makes it optional for API users worldwide
AI 摘要
OpenAI 将在欧盟为 ChatGPT 和 Codex 生成的文本添加名为 textGrain 的隐形水印，以符合欧盟 AI 法案对机器可读标注的要求，未来几周内上线。API 用户在全球范围内可选择开启水印，而 Anthropic 对 Claude 的水印则是强制性的。OpenAI 称水印不影响输出质量，但检测率受文本长度、主题和编辑影响较大，替换 25% 的词语即可将检测率降至 17%。检测器初期仅向部分研究者和专业机构开放申请。
正文节选
OpenAI will watermark ChatGPT text in the EU but makes it optional for API users worldwide OpenAI is adding invisible watermarks to ChatGPT text to comply with EU rules. Unlike Anthropic, it will let API customers worldwide turn them off. The EU AI Act reportedly requires AI providers to label generated text in a machine-readable format. OpenAI's answer is textGrain, a technology that embeds an invisible statistical signal in the model's word choices. It works much like Claude's SynthID watermar