Apparently it's easy to detect LLM-generated text now
papers.ssrn.comIt's been my understanding since GPT-3 that tools that claim to identify LLM authorship of arbitrary text are basically unreliable.
This apparently is not true anymore: Pangram has a false positive rate below 0.5% and is robust to various adversarial techniques.
It offered a free demo, but it wanted me to subscribe first, so I declined.