ChatGPT had an estimated 20,000 hours of human feedback. That’s not going to be easy to replicate in an open source way.
Enough programmers want this badly enough that its going to happen. Inference at 8 GB and fine tuning at 24 GB, just like stable diffusion, on a 13B model.
For a model running on my own laptop I'm OK taking more risks. I'd like it to be able to obey simple instructions like "Summarize this text" or "Extract the names of everyone mentioned in this article" - I don't care as much about the stuff ChatGPT has to get right.