I built my first "real" GUI app recently with the help of Codex, as in actually looks and feels good.

I used GPUI and the one-dark theme from Zed and it's super smooth, the code is super easy to understand and I love the way it looks.

Not quite as simple as the VB6 and forms apps of my youth but as a Rust dude I definitely grokked it easily and was surprised how much of it I was able to do myself once the agent had helped with wiring up the scaffold.