Apple prepares September 14 launch with iOS 27 RC builds

Following the "Surprise and Shine" event, Apple has officially transitioned its next-generation operating systems into the Release Candidate (RC) phase. This move signals that development for the initial public versions is essentially complete, with a global rollout scheduled for Monday, September 14.

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The RC builds are now available to developers and public beta testers via the Software Update screen in Settings. While these versions are intended to be the final shipping software, Apple may issue a second RC if critical bugs are discovered before Monday.

The AI Core: Siri AI and Apple Intelligence

The centerpiece of this update cycle is the arrival of Siri AI, a fundamental overhaul of Apple's voice assistant. Unlike previous iterations, Siri AI leverages next-generation Apple Foundation Models and a strategic partnership with Google's Gemini models to provide an experience closer to modern Large Language Models (LLMs). The revamped assistant can now utilize personal context for in-depth answers, search the web to generate complete responses, and handle complex requests across various apps.

However, hardware limitations apply. While iOS 27 is compatible with iPhone 11 and later (or SE 3rd gen), the advanced Siri AI features require an iPhone 15 Pro or higher. Similarly, on iPad, the most sophisticated AI capabilities are reserved for models with M4 chips and 12GB of RAM or more. Initially, Siri AI will be available only in English, with support for French, Japanese, Korean, Portuguese, and Spanish arriving next month.

Ecosystem-Wide Updates

The RC wave covers the entire Apple hardware spectrum:

• iOS 27 & iPadOS 27: Beyond AI, these updates introduce the "Liquid Glass" aesthetic and enhancements to Control Center, Photos, and Screen Time. iPadOS 27 specifically continues the trend of convergence with macOS, featuring a persistent menu bar and improved file transfer speeds.
• macOS 27 Golden Gate: The Mac receives its own RC (build 26A428), finalizing the transition to a more agentic workflow.
• watchOS 27: The RC (build 24R363) includes features unveiled during the hardware event, such as AI-driven daily recaps and a modular Siri face.
• tvOS 27 & visionOS 27: Both systems receive RC builds to ensure compatibility with the latest hardware and AI integrations.

Critical Pre-Update Step: iOS 26.6.2

For users planning to install iOS 27 on day one, a critical interim update has been released. Apple shipped iOS/iPadOS 26.6.2, which specifically patches a bug that prevented software updates from being downloaded over cellular connections. To ensure a seamless transition to the new OS on September 14, users are encouraged to install this patch immediately.

Technical Build Reference

For developers and power users, the primary RC build numbers are as follows: