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What's new in Swift: June 2026 Edition
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Swift is moving deeper into systems programming and cross-platform infrastructure, with Apple now writing OS kernel components and the QUIC transport layer in Swift. The upcoming Foundation Models framework open-sourcing means the same Swift APIs for LLM integration could run on both Apple platforms and servers, reducing context-switching for developers building AI features.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Apple announced that parts of the core operating system kernel are being written in Swift, and the TrueType hinting interpreter rewrite from C to Swift runs 13% faster on average.
Swift 6.4 previews include up to 4x faster URL parsing and support for async code in defer blocks.
The Foundation Models framework utilities package is released now with LLM tools including custom skills and context management helpers, and the full framework will be open sourced for cross-platform server use.
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