- Sources: Apple developer page
- Summary: Apple's page states the coding assistant is powered by the model of the developer's choice and supports multiple ways of working with agents across prototyping, implementation and polish, and that agents can add languages, update string catalogs and translate strings with Xcode supplying language-specific style guidelines as context. Device Hub consolidates devices and simulators in one place for reproduction and inspection, and Instruments adds a Swift Concurrency instrument covering async task scheduling, actor contention and thread usage, plus top-function and run-comparison views. The page is Apple's feature description and carries no version-specific release date and no build number, and Apple's release post covers the operating systems rather than Xcode, so no source read this run establishes that Xcode 27 has shipped.
- Why it matters: Apple describes third-party model substitution on a developer surface it controls, which is the question the Siri framework item on this page leaves open for the assistant.
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