Depends how you get in accomplished if you use the python bindings its slow but using the gpt4all its quick and there is a gpt4all api should you wish to build a private assistant. I like that one but its still run by a company so mileage may vary there are a few projects on github for use with opensource models. I can get better quality from the hermes model than i can with GPT 3.5 IMO but some models are better than others in regards to what you are trying to do. If you have done any work with stable diffusion lots of different models are popping up right now for different use-cases like you see on civit.ai. A good coding bot is probably going to be a bit shit in a conversation.
How does it compare with ChatGPT (GPT 3.5), quality and speed wise?
Depends how you get in accomplished if you use the python bindings its slow but using the gpt4all its quick and there is a gpt4all api should you wish to build a private assistant. I like that one but its still run by a company so mileage may vary there are a few projects on github for use with opensource models. I can get better quality from the hermes model than i can with GPT 3.5 IMO but some models are better than others in regards to what you are trying to do. If you have done any work with stable diffusion lots of different models are popping up right now for different use-cases like you see on civit.ai. A good coding bot is probably going to be a bit shit in a conversation.