Whats new in Xcode?

Xcode 16 introduces several exciting new features and improvements to enhance the development experience. Here are some of the key updates:

Code Completion:
- Xcode 16 features a new code completion engine powered by a model specifically trained for Swift and Apple SDKs. This engine uses your project symbols to customize suggestions and runs locally on your Mac, ensuring privacy and fast results. This feature is available when running Xcode 16 on macOS Sequoia. Platforms State of the Union, What’s new in Xcode 16.
Swift 6:
- Swift 6 introduces a new language mode that provides concurrency safety guarantees, turning data races into compile-time issues, which improves the correctness and safety of your code. What’s new in Xcode 16.
Xcode Previews:
- Xcode Previews now use a new dynamic linking architecture that avoids rebuilding your project when switching between previews and builds, making the workflow smoother and more productive. Platforms State of the Union, What’s new in Xcode 16.
Swiftassist:
- Swiftassist is a new companion tool for coding tasks, leveraging a powerful model that runs in the cloud. It can help with tasks like experimenting with new APIs and answering coding questions, making it easier to transform ideas into code. Platforms State of the Union.
Build Improvements:
- Xcode 16 introduces explicit modules for improved parallelism, better diagnostics, and faster debugging. For C and Objective-C, explicit modules are on by default, while for Swift, you need to opt-in. What’s new in Xcode 16.
Debugging and Performance:
- The thread performance checker now surfaces runtime issues, pinpointing the exact location of problems. Additionally, the organizer now includes diagnostics for excessive disk writes and slow app launches, helping you prioritize and fix performance issues. What’s new in Xcode 16.
Instruments and Flame Graphs:
- Xcode 16 includes a flame graph feature in Instruments, providing a visual way to see call stacks and identify performance issues. This is useful for profiling your app regularly. What’s new in Xcode 16.

For a more detailed overview, you can watch the sessions Platforms State of the Union and What’s new in Xcode 16.