Looks outdated by now. Try R1. Seriously, I've been using LLMs for coding for a while and can say early experience was disappointing, but they get better and better fast. The latest o1 looks a lot better than 4o. It's reasonable to expect with proper human supervision and interface they will be able to handle big files and projects in a year or two. Interesting times...
They also said that a year or two ago
Hmm... I can try... OAI has something called 'projects', but local handling with API calls is probably the right way of doing it. Easier to switch providers, run and debug in place. With current prices it should be like < $10/month.