No-one has really attempted this yet to me knowledge (the closest is us AI Dungeon as per @loverdrive but that is a true AI (if I understand it correctly), just not one designed for this).
It's kinda designed for that. Well, it's just a GPT-3 trained on a ton of CYOA stories and some literature, and it gives reasonably good answers to prompts. As is, it's basically like playing a freeform roleplaying game with a bit senile novice game master.
It works really well with PbtA games, if you just decide whether your PCs actions trigger a move, resolve it and feed AI the output. Like:
You are outnumbered and outgunned: NINE guys, armed and angry. naughty word's going south. You peek out of your cover...
...and hear that nasty CLANK-CLANK of a grenade rolling on the floor. What ya gonna do?
Here, to my surprise, AI actually picked up on me highlighting some words with all caps, and using ellipsis.
Then, I decided that my gal is gonna hide behind a fridge (this scene is taking place in a slaughterhouse, so I'd say that's reasonable). It triggered Act under fire move, and I rolled 8. So, worse outcome it is — I guess it's 0-harm, I make Harm move and get a 7. Lost footing, I guess, so I write:
You dive behind a heavy industrial fridge as explosion goes off. You don't resemble swiss cheese full of shrapnel, but your ears are ringing and your vision is blurry — you've suffered some serious concussion.
Instead of waiting for AI to reply, I thought that my gal is gonna open her brain to the psychic maelstrom to see the possible future, as she can't really do anything else. It's a fail, so I continue with:
You open your mind to the psychic maelstrom and listen...
You wince in pain, as the noosphere retaliates against you, and ...
I left the sentence unfinished, so AI can pick it up for me. It responded with
you're overwhelmed by a storm of angry thoughts and emotions. You realise that you're now on the second floor of a building, which is bad news as there are raider scum on the first floor searching for you.
Which is kinda boring, but makes sense. Tomorrow I'm gonna play to find out what happens next.
The only thing I
really don't like is that this horny computer bastard sometimes decides to describe how scantily clad my character is for no real reason.