alt Hacker News> slop sniff test
An unexpected challenge being that our sense of smell requires continual readjustment: Heavy use of em-dashes was formerly a "tell", but the AI-masters retrained them, and now they do the opposite. Indeed, there's a general scarcity of any punctuation other than the period.
It's continually evolving, but a gold standard tell is being very punchy and listy without any semantic content whatsoever. I don't think you can really fix that without heavier human involvement, which undercuts a lot of the slop use-cases. You have to know what you want to say, or the robot will just spin its wheels - and having something to say and a way to say it is kind of the part that requires the most work, so that's not attractive if you're running a bot farm.