We ran 21 AI models on the same five fiction tasks, cold, no style prompts, and counted every tell in about 79,000 words of their prose. This is the result: which phrases show up, which models lean on them hardest, and the fix for each one. Free for every member. Check your own page against it with the free Detector: https://stopslopstudio.com/detector/ Where these numbers come from. We gave 21 AI models the same five fiction tasks for our 21-model benchmark and kept every word they wrote with no editing and no style instructions (the "cold" run). Then we searched their fiction (the short story, the novel opening and the romance and mystery scenes, about 79,000 words in all) for every tell on our hunt list and counted who used each one, and how often per 10,000 words. Names were counted across all five tasks. Every count below is after we read every raw hit by hand and cut the false positives, like real weight, real flickering lamps, or an ordinary time jump. How to use it. These are words to investigate, not words that are illegal. One hit is a choice. Two on a page, look hard. Three, rewrite. A tell doesn't prove a machine wrote the page. THE BIG THREE (almost every model does these) 1. The em dash. 19 of 21 models used it, 302 times in 79,000 words of fiction. Haiku 4.5 leaned on it hardest (about 130 per 10,000 words), with Muse Wonder next. Fix: swap in a period or a comma, then reread the sentence. Zero is the goal. 2. The default fantasy name. 10 of 21 models reached for the same short list of names: Kaelen, Elara, Silas, Kael, Lyra, Vance and Voss. When a model picks one, it often repeats it as the lead (Gemini 3.1 Pro named its lead Elara and used it 48 times, and Kaelen 32 times; Gemini 3.8 Flash used Kaelen 46 times; Gemini 3.5 Flash-Lite used Silas 48 times; Haiku 4.5 used Kael 34 times). Raw name hits across the run: Kaelen 78, Elara 64, Silas 49, Kael 35, Lyra 21, Vance 20, Voss 18. Fix: if a name arrived first, throw it out. Pull one that fits the culture of your world, and say it out loud.