Best new Xcode 16 feature

The best new feature in Xcode 16 is the enhanced code completion powered by an innovative new engine that can predict the code you need. This engine uses a model specifically trained for Swift and Apple SDKs, leveraging your project symbols to customize suggestions. It runs locally on your Mac, ensuring your code remains private and providing super-fast results, even when offline. This feature is a significant leap forward in improving developer productivity and efficiency.

For more details, you can check out the session What’s new in Xcode 16 at the 00:33 mark.