The Economist: How to Spot AI Writing
- ID: 080a2fa8
- Original: https://www.economist.com/culture/2026/07/30/how-to-spot-ai-writing
- Added: 2026-08-12
- Source: blog / The Economist
- Original Date: 2026-07-30
- AAIF Category: industry
- Quality Score: 3
- Status: active
- Source Type: article
- Language: en
- Tags: ai-writing, detection, watermark, economist
中文摘要
经济学人拿自己的稿子训了四个 LLM，发现 AI 写作的指纹和你以为的不一样研究方法很扎实（55,940 句120 万词四个主流模型跨三家媒体做基线），结论有几条反直觉比如最新版本后只有 Claude 用 em-dash 比人多，ChatGPT 用得反而最少AI 偏拉丁词缀长句低标点少引语；和 AI 满篇 em-dash 的民间印象相反，识别 AI 写作更好的办法是看几乎没有标点的段落，而不是找破折号
English Summary
The Economist trains four LLMs on its own copy to find AI-writing fingerprints - and several findings cut against folk wisdom. Methodology is solid: 55,940 sentences, 1.2M words, four frontier models, cross-benchmarked against three other publications. Counter-intuitive result: only Claude uses em-dashes more than humans in its latest version; ChatGPT actually uses them least. AI prose skews toward Latinate morphology, long sentences, low punctuation density, and few quotes. Better tell than em-dashes, the article argues, is a near-punctuationless paragraph.
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