watchOS 27 code reveals four changes for Apple Watch Ultra 4, more
Apple has officially released watchOS 27, bringing an AI-powered Siri overhaul, a dynamic app grid, a new single-tap gesture, and expanded health and fitness capabilities to compatible Apple Watches. The software update coincides with the launch of the newly introduced Apple Watch Series 12 and Apple Watch Ultra 4, which were revealed by Apple last week. Both flagship watch models are powered by the new S11 chip. The operating system update is rolling out now to users globally alongside other major platform software releases from Apple.
What changed
Apple released watchOS 27 with an AI-powered Siri overhaul, a dynamic app grid, and new single-tap gestures.
Live updates
-
Apple Releases watchOS 27 With Siri AI and S11 Chip Support
Apple has officially released watchOS 27, bringing an AI-powered Siri overhaul, a dynamic app grid, a new single-tap gesture, and expanded health and fitness capabilities to compatible Apple Watches. The software update coincides with the launch of the newly introduced Apple Watch Series 12 and Apple Watch Ultra 4, which were revealed by Apple last week. Both flagship watch models are powered by the new S11 chip. The operating system update is rolling out now to users globally alongside other major platform software releases from Apple.
Why it matters
The rollout of watchOS 27 follows Apple's recent hardware announcements for the Apple Watch Series 12 and Apple Watch Ultra 4. Developers previously discovered via Xcode 27 that these new wearable models feature 4GB of RAM, doubling the memory capacity of their predecessors. While Apple did not highlight the hardware upgrade during its September event, the devices arrive alongside the broader integration of Apple Intelligence features across the company's software ecosystem.
What is confirmed
- Apple has released watchOS 27 with an AI-powered Siri overhaul, a dynamic app grid, a new single-tap gesture, and expanded health and fitness features.
- Apple introduced the Apple Watch Series 12 and Apple Watch Ultra 4 last week, featuring the S11 chip.
- Apple's latest software updates introduce Siri AI and deliver helpful new Apple Intelligence features.
What to watch next
- Monitoring retail availability of the Apple Watch Series 12 and Apple Watch Ultra 4 at the end of the week.
- Observing user feedback and performance metrics regarding the watchOS 27 roll-out and Siri AI reliability.
confidence 100%Sources used for this update (8)
- www.apple.com — Major updates for Apple’s software platforms are now available
- www.pcmag.com — Apple Watch Series 12 vs. Ultra 4: 7 Key Differences You Need to Know Before Buying
- www.theverge.com — Apple releases iOS 27 with Siri AI overhaul
- 9to5mac.com — watchOS 27 now available for Apple Watch, here’s what’s new
- www.macstories.net — watchOS 27: The MacStories Review
- appleinsider.com — Apple brings smarter Siri and better health tracking to Apple Watch in watchOS 27
- 9to5mac.com — tvOS 27 available now for Apple TV 4K, here’s everything new
- www.theapplepost.com — Apple releases watchOS 27 with Siri AI, dynamic app grid and new gestures
-
Apple Watch Ultra 4 and Series 12 double RAM to 4GB
The Apple Watch Ultra 4 and Series 12 feature 4GB of RAM, doubling the 2GB found in the Ultra 3 and Series 11. MacRumors confirmed this hardware upgrade via Apple's Xcode 27 developer tool. Apple did not mention the memory increase during its September 2026 event. These watches arrive alongside the foldable iPhone Ultra and a watchOS 27 update scheduled for release next week. The Ultra 4 specifically emphasizes improved battery life and advanced health and fitness features for adventure users.
Why it matters
CEO John Ternus led the September 2026 keynote where these devices were debuted. The hardware updates coincide with the launch of watchOS 27, which introduces a Siri Modular watch face.
What is confirmed
- The Apple Watch Series 12 and Apple Watch Ultra 4 are equipped with 4GB of RAM.
- The Apple Watch Series 11 and Apple Watch Ultra 3 have 2GB of RAM.
- Apple's developer tool Xcode 27 contains the RAM specifications for the new models.
- watchOS 27 is scheduled for release next week.
What to watch next
- Official Apple confirmation of the RAM specifications
- Public release of watchOS 27
- Performance benchmarks comparing 2GB and 4GB models
confidence 100%Sources used for this update (5)
- www.macrumors.com — Newer Posts
- 9to5mac.com — Apple Watch Ultra 4 and Series 12 have surprise upgrade that wasn’t announced
- 9to5mac.com — watchOS 27: Here are Apple’s full release notes for new update
- www.macrumors.com — Apple Watch Series 12 and Apple Watch Ultra 4 Have a Pleasant Surprise
- sports.yahoo.com — How to watch Premier League 2026-27 for *FREE*
-
Apple Watch Ultra 4 and watchOS 27 Details Revealed
Apple introduced the Apple Watch Ultra 4 during its September 2026 event, highlighting improved battery life and advanced health and fitness features for the adventure watch. Code from watchOS 27 additionally pointed to four distinct changes for the hardware alongside a new Siri Modular watch face. Apple confirmed that the watchOS 27 upgrade is scheduled for release later this month. Concurrently, the keynote marked the first event led by new Apple CEO John Ternus, featuring announcements for the Apple Watch Series 12 and the foldable iPhone Ultra.
Why it matters
The September Apple keynote serves as the primary platform for annual hardware rollouts, though this year marked a leadership shift with John Ternus taking the helm. Observers tracked the event for updates on both the Series 12 and the new Ultra 4 models. Software updates like watchOS 27 often introduce interface adjustments and new watch faces that define the upcoming hardware cycle.
What is confirmed
- Apple introduced the Apple Watch Ultra 4 on September 9, 2026.
- The Apple Watch Ultra 4 features improved battery life and new health and fitness functions.
- John Ternus is the new Apple CEO who helmed the September 2026 keynote event.
- watchOS 27 is scheduled for release in September 2026.
Still unconfirmed
- Apple Watch Series 12 copies a feature from Oura and Whoop.
- The Apple Watch Series 12 may feature minimal differences compared to predecessor models.
What to watch next
- The public release of watchOS 27 later this month
- User testing and battery benchmark results for the Apple Watch Ultra 4
confidence 95%Sources used for this update (10)
- www.cnet.com — Apple Event 2026 Live: The First Foldable iPhone, iPhone 18 Pro, Apple Watch 12 and More
- 9to5mac.com — watchOS 27 code reveals four changes for Apple Watch Ultra 4, more
- Forbes — Apple Event: What To Expect From Apple Watch Series 12 And Ultra 4
- AppleInsider — Apple Watch Series 12 may not be much different, but watchOS 27 still has surprises
- MacRumors — Apple Watch Ultra 4 to Get Improved Battery Life
- PhoneArena — Apple Watch Series 12 reported to copy a beloved Oura and Whoop feature
- tech.yahoo.com — Apple Event 2026 Live: The First Foldable iPhone, iPhone 18 Pro, Apple Watch 12 and More
- finance.yahoo.com — Apple unveils Apple Watch Ultra 4
- 9to5mac.com — watchOS 27 upgrade coming to Apple Watch this month
- 9to5mac.com — watchOS 27 will add new Siri Modular face for Apple Watch