AI Dungeon now uses the largest GPT-3 model offered by OpenAI
medium.com
medium.com
But if you just do "custom" scenario, it works well.
Here's navy seal copypasta parody, like Gwern did (through he had much longer prompt; I could fit only one long and one super-short example): https://pastebin.com/Lc7tC8j9
I've been most impressed by this so far, because I didn't expect GPT-3 to handle language other than English so well: https://www.reddit.com/r/slatestarcodex/comments/hqnteu/my_t...