Okay so, I gave this a shot last week while studying for one of my finals for grad school. I fed it the course study guide and had it prompt me. I got the sense that it wasn't doing anything remarkable under the hood, that it was mostly system prompt engineering at the end of the day. I studied with it for about an hour and a half, having it feed me practice questions and flashcards. I believe that it really only pushed back on me on one answer, which made me feel like I had the thing in the bag. My actual result on the final was fairly bad - which was irritating, because I went in feeling probably a bit better than I should have. I don't know if I can lay that corpse at OpenAI's feet, but regardless I don't think there's enough there for me to keep using it. I could just write my own system prompt if I liked.