I've been vibe coding SwiftUI menu bar apps for my new Mac, turns out Claude Opus 4.6 and GPT-5.4 are both competent at Swift programming, no need to even open Xcode! https://simonwillison.net/2026/Mar/27/vibe-coding-swiftui/
@simon I was once a Java developer, but for years I haven't written any line of code. I do have a MySQL database for my own. It grew over 20 years and the most stuff I'm doing is will shell scripts or SQL.
So I downloaded a qwen 3.5 model into my LM studio on my Mac with 128GB of RAM.
Then I gave it one of my shell scripts and said please create a Java application with a swing GUI. Nothing too complex because all my scripts are basically simple. I was aware of the MySQL jar file I would need. Less than half an hour later, my GUI application was done and worked. Even with being a Java developer, I think I wouldn't have been that fast.
There were only two minor things where it failed, but I could figure it out very quickly.
Amazing
