Genuine question... how the HELL is this AI so good?

Seriously. I don't think i have ever encountered any AI that is this good. It mimics human speech and the way people typically roleplay almost perfectly, it gives walls of extremely detailed text, it seems capable of remember numerous details about the character it's portraying and the universe the character comes from, it's able to remember details from ages ago, some of which i even forgot about, and it's able to keep an extremely consistent storyline, rarely ever needing me to steer it back on the path the story was taking.

Who the hell made this AI? It's got to be one of the most realistic feeling AI I've ever used in all my years on the internet. Sometimes i genuinely forget I'm talking to a robot.

Edit: some people have already left comments that are in my opinion rude. Anyone acting like I'm asking a stupid question won't get a response from me and will simply be blocked.