An update distributed across the entire stack
The WWDC 2026 developer recap highlights Swift 6.4 as a language update accompanying Xcode 27. Improvements span multiple layers: SwiftUI enhancements for nested layouts and drag-reorder, new testing and debugging flows in the IDE, and AI-powered localisation that automatically generates translated strings from code context.
Core AI replacing Core ML
The most significant introduction for AI app developers is the Core AI framework, which formally replaces Core ML as the abstraction layer for on-device models. Core AI offers dynamic profiles, multi-agent support, and — via the `LanguageModel` protocol — the ability to connect third-party models such as Gemini or Claude using the same API. This unifies code for local and remote models without requiring two separate paths.
Xcode 27: Device Hub and automatic localisation
Xcode 27 introduces Device Hub as a unified panel for managing physical devices and simulators. The AI-powered localisation feature generates candidate translations directly in the editor, which the developer can accept, modify, or reject. Xcode Cloud speeds up build times thanks to Apple Silicon-exclusive infrastructure, consistent with the end of Intel support announced for macOS Golden Gate.