September 15, 2026 — Apple released its biggest software update of the year yesterday, and it's not just one operating system. iOS 27, iPadOS 27, macOS 27 Golden Gate, watchOS 27, tvOS 27, and visionOS 27 all shipped on September 14 [citation:13]. The centerpiece is Siri AI, a ground-up rebuild of Apple's assistant powered by Apple Intelligence. But there's a second story buried in the release notes — one that signals the end of an era [citation:6].

macOS 27 Golden Gate is the first version of macOS that will not install on any Intel Mac [citation:3][citation:15]. Apple confirmed this cutoff a year in advance, and the release marks the completion of Apple's six-year transition to its own silicon. For owners of older Macs, the clock is now ticking on a three-year security window [citation:3].

Siri AI: The New Center of Apple's Ecosystem

Siri AI is the single biggest feature across all of Apple's new operating systems. Unlike the classic Siri, which handled timers and weather but struggled with complex requests, Siri AI is built on Apple Intelligence and can hold conversational interactions, understand personal context, and take actions across apps [citation:1][citation:4].

Key capabilities include:

• Dedicated Siri app: Conversations sync through iCloud across iPhone, iPad, and Mac, so you can start a request on one device and finish it on another [citation:1][citation:4]
• Spotlight integration on Mac: Ask Siri directly from Spotlight without opening a separate app [citation:4][citation:9]
• Visual Intelligence: On macOS, a keyboard shortcut (Command-Shift-Space) lets you select anything on screen and ask Siri about it — an image, a PDF, or text [citation:1][citation:9]
• Personal context: Siri can search across Mail, Messages, Photos, and more to answer personalized questions [citation:1]
• Cross-app actions: Create reminders, send messages, manage music, add calendar events, and more [citation:4]

macOS 27 Golden Gate: The End of the Intel Era

While Siri AI dominates the headlines, macOS 27 Golden Gate carries its own historic weight: it is the first macOS that does not support any Intel-based Mac [citation:3][citation:6].

Apple announced this transition at WWDC 2025, naming macOS 26 Tahoe as the final Intel-compatible release. Golden Gate follows through on that deadline without exception [citation:3].

The following Intel Macs are excluded — all of which had survived through Tahoe [citation:3][citation:15]:

Intel Mac owners are not immediately stranded. Apple has committed to security patches through September 2028 — a three-year runway [citation:3]. But the message is clear: the transition is complete, and future macOS development will be Apple Silicon only.

macOS 27 also marks the final general-purpose release of Rosetta 2, the translation layer that lets Intel-compiled apps run on Apple Silicon. Starting with macOS 28, only a stripped-down compatibility mode will remain for legacy software like older games [citation:3].

Key New Features Across Platforms

Beyond Siri AI, Apple's September update brings a range of features across iOS 27 and macOS 27. The table below highlights the most notable additions and their availability.

Compatible Devices: iOS 27 vs macOS 27

The hardware requirements for iOS 27 and macOS 27 differ significantly, especially for AI features. Here's the breakdown.

What Chinese Users Actually Get

For Chinese users, the situation is straightforward: Siri AI and the other new Apple Intelligence features are not available in mainland China [citation:5][citation:10]. Apple has stated it is working through regulatory requirements, but no timeline has been provided [citation:5].

What Chinese users do get:

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Key Takeaways