Sitefire trains classifier to detect AI content by structure

YC W26 startup Sitefire ported the StoryScope method to commercial web pages: it collected 2,250 pre-ChatGPT B2B blog posts from 268 company sites, had five models including GPT-5.4 rewrite each, and trained a classifier on 214 structural questions, reaching 98% accuracy separating AI from human posts.

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