I've recently started using Claude Opus which i prefer for coding and maybe in general. Apart from the crappy message limit and lack of stop and edit buttons. I think it might stick with it and cancel gpt.
In general i use Ai to help with my job of general it guy, marker, admin, data entry etc. i use it to proof read, to get ideas, to transform data, to code it or to comment code, translate, transcribe, to bug fix. I always feel i could be making better use of it in my day but it is transformative for the stuff it does.
For the API I'm using a workflow for Alfred on Mac that allows me really quick key presses access to prompts and questions on selected text. I love it.