this has been very interesting to dive into and as a result, I ended up writing a separate code that detects Claude, Deepseek, and some ChatGPT (and colour codes based on what is used). which, yes, do have their own remnants that I was able to figure out!
Unequivocal proof of AI (Claude-generated) content is buried in its HTML and can be found, across fandoms, in a number of well-known fanfics on Archive of Our Own. This includes, notably, OpalApparition’s “Nutcracker!” and frozenmorningdew’s “hanging by a moment”. 🧵