I run Witcher CYOA, it works to some extend. Of course you have to fill lots of "lorebook" entry so that the AI does not contradict itself and will remember important shit.
Like I said, it's a Solo PnP RPG. To see how long the AI could take me before being incoherent. Now there quite few PnP RPG that offer Solo run, like the recent One Ring 2nd Edition and newest DnD. Heck DnD even supposedly got an AI GM before it got dumbed down.
Suffice to say that with many issues that ChatGPT got and even that Bing AI over being "moral guardian" like mentioning murder (despite a fictional setting can be rife of such stuff) and even gaslighting you over some stuff. I am well impressed with Novel AI