have you tried it recently? o3-mini-high is really impressive. If you ease into talking to it about your intent and outlining the possible edge and corner cases it will write nuanced rust code 1000 lines at a time no problem
The use cases I list are all over the past 8 months. One of the things that drove me away from copilot and chatbots is that I just write better code faster than it can. I could sit there for an hour, fiddling with prompts, and copy-pasting output into a text editor, or I could just write the damn code.