On another note, I recommend not using ChatGPT because it has been established to be significantly worse than Claude (yes, including o1 and o1 Pro, which are also severely out of date in their knowledge of Swift SDKs). Yes, even during my brief tests of Alex Sidebar I did notice the increased competence of Sonnet over OpenAI 4o/o1. Have been thinking of cancelling my GPTPlus subscription and will probably do so after I get to play with o3-mini (release purportedly any day now). The expectation that Swift Assist would have been trained on the latest APIs and docs and internal code at Apple was really exciting, but that thing is nowhere to be found as far as I can tell. It is called Swift Assist, right? All I remember is the WWDC session where they quickly build a "Classic Macs" demo app and it looked excellent. Again, I expect Apple have something even better cooking. Either that or it's just taking them a lot longer than expected to train a model that works well. Alex Sidebar is probably about as good as a third-party can do, though I expect their business may be short-lived when and if Apple steps in with a real first-party solution.

Update: Alex Sidebar is indeed useful, definitely a cut above the ChatGPT macOS app for AI-assisted/AI-pair programming in Xcode. Also, it appears I spoke too soon re: not being able to use other/local LLMs via API. Have not tested this yet but it does seem possible from what I briefly saw on Discord. Overall, it's not the equivalent of something like the Roo Code extention to VS Code in terms of being able to build working, multi-source-file projects from a mere idea prompt, but it helps. Many thanks for suggesting it!

Thank you, I'll give the free version a try. I immediately don't like that I can't use local LLMs or my own API keys, but okay for now. Also, since Apple engineers stalk this forum: I'm sure Apple must be on this in some way, shape, or form (whether alone or in partnership with OpenAI), but please train and release a Computer-Using Agent on at least Xcode (preferably on the entire UI as well as all of your first-party apps). Within 6-18 months I'd like my Mac's desktop CUA to be working 24x7 on improving my code. I give even odds OpenAI already has a prototype of this working internally. The obvious benefit to Apple are the endless skid palettes of Mac minis that will be sold for use as dedicated agent servers both for personal and business use. My pet theory as to why Swift Assist has vanished is something even better such as this sort of Xcode-savvy CUA is on the way. Make it so, Apple!

I believe I may have found the issue: a missing W-9 in my US Tax records (I live in Ireland but have dual citizenship). Added it, and my TestFlight build immediately loaded the (still as yet unapproved) products list. I'll update once more if it's all good. Sure wish App Review had said so instead of sending me scouring through technical documentation and code for a week! :)