> I think earlier this year someone listed an LLM as a coauthor on a paper

This is not as radical as it sounds. People did stuff like that all the time pre-LLM. It's just a question of how fussy the journal's editor is. See https://www.wired.com/2013/03/computers-and-math/ for examples in math.

HN discussion on that article: https://news.ycombinator.com/item?id=5322313