I spent 3 months on Pi and the Opencode Go plan for open model inference. I've never had so much fun on a computer. If you are looking for a place to start, that should be it. Or check out: https://github.com/huggingface/tau at https://twotimespi.dev
I've now use GPT-5.5 as the primary. Code quality was just higher. I tinker and do R&D with open models then come back and refactor my slop into usable code I can save for future use.