o1-preview built me an iOS app that is now in the app store. It only took me about 3 hours of back and forth with it go from very basic to adding 10 - 20 features, and it didn't break the existing code when refactoring for new features. It also generates code with very little of the cruft that I would expect to see reviewing PRs from human coders. I've got 25 years build / deploying / running code at every size company from startup to FAANG, and I'm completely blown away how quickly it was able to help me take a concept in my head to an app ready to put in front of users and ask them to pay for (I already have over 3,000 sales of the app within 2 weeks of releasing).

My next step is to ask it to rewrite the iOS app into an Android app when I have a block of time to sit down and work through it.