It's called 6b.eleuther.ai and it is a "six billion parameter, autoregressive text generation model."
Enter some text, and it'll take it from there- writing a prose that sometimes sounds like poetry, other times like gibberish, and some offerings that sound so writerly that at first I thought it was pulling up book excerpts via google. It's not, however - it's actually writing.
I've seen it on Tumblr quite a bit this week - fandom folks entering their favorite character dialogue and/or character names, and seeing what the A.I. is inspired to give them back.
So today's really random is self-powered and very 21st Century. Give it a try- who knows what fic the AI's prompts may inspire?