I’m curious what professional iOS developers are currently using for their Swift/SwiftUI work.

For modern iOS 26 development, how would you compare:

1. GPT 5.5
2. Claude Opus 4.7
3. GPT 5.3 Codex

I’m mainly interested in practical coding help:

• SwiftUI architecture
• SwiftData
• concurrency / actors / u/MainActor
• debugging compiler errors
• refactoring existing code
• reasoning about Apple APIs
• generating production-quality code
• avoiding outdated SwiftUI patterns

I’m not asking about vibe coding or generating whole apps without understanding the code. I’m interested in day-to-day help for developers who still read, test, and own the code.