Basically chatGPT you can run on your own PC or google colab instance.
Here's the latest update that will give you some idea of what's going on:
https://www.youtube.com/watch?v=199h5XxUEOY
There's a huge amount of open source, free LLM models available now.
First time hearing of this. Just saw the sub linked in the lemmy sidebar and checked it out. I've get the script running in the background. Could be fun.