There are tools out there that claim to be able to tell the difference between LLM-written prose and the old-fashioned biological product. I'm wary of them, partly due skeptism about their accuracy, but also because it rather misses the point. The reaction to LLM-Voice is a human one, that sense that we are in an uncanny valley of prose. By the time I'd reach for a tool to tell me what I'm reading, it's already too late, even if it confidently tells me there's no LLM present.
I'm also suspicious of my own ability to accurately recognize LLM voice. Language changes over time, so a common sign of age is complaining about the language of the youngs. I'm inclined to bristle at prose that talks about “adopting a new sales motion,” or “a sharp round-up of news”. But I've heard these constructs coming out of human mouths, so that's more a generational difference rather than between carbon and silicon. (And as a transplanted Brit, don't get me started on Americanisms, I'm sure I'll get used to them momentarily.)
