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The Apple Watch Ultra 4 is ready for the new Siri

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Why This Matters

Apple's Watch Ultra 4 keeps last year's design but swaps in the new S11 chip, positioning the flagship wearable to run the upgraded Siri assistant arriving with watchOS 27. The bigger consumer story is health sensing: better ECG electrodes and more efficient green LEDs enable heart rate readings up to 60 times more often, at five-second intervals.

Key Takeaways
Worth a Look

Apple Watch Ultra 3 — While the Ultra 4 is fresh off the keynote, the Apple Watch Ultra 3 shares nearly the same rugged titanium design and is available right now. It's built for hiking, diving, and long training days, with the bright display and durability the Ultra line is known for.

See Apple Watch Ultra 3 on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.

is a senior reporter who’s been covering and reviewing the latest gadgets and tech since 2006, but has loved all things electronic since he was a kid.

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Apple announced the next version of the rugged and durable Apple Watch Ultra at today’s “Surprise and shine” event.

The Apple Watch Ultra 4 features a design that’s nearly identical to last year’s Apple Watch Ultra 3 but is powered by Apple’s new S11 processor, which replaces the aging S10 chip first introduced with the Apple Watch Series 10 in 2024. The S11 will bring some much-needed performance improvements to the Ultra 4 ahead of Apple’s upcoming watchOS 27 release that will include the smarter and more capable Siri AI assistant announced at Apple’s annual WWDC conference earlier this year.

The Apple Watch Ultra 4 features an improved sensor with upgraded electrodes for better ECG measurements alongside more power-efficient green LEDs allowing for more accurate heart rate measurements all day long and during physical activities. The improved energy efficiency allows the Ultra 4 to take heart rate readings up to 60 times more frequently than previous models at 5-second intervals. Heart rate variability measurements, a metric that provides insights about how your body responds to stress and recovery, can now be taken every five minutes.

The new model follows the Apple Watch Ultra 3, which launched last year. That watch debuted with upgrades including improved battery life, support for 5G networks on the cellular model, satellite-based messaging and emergency calling, and a slightly larger display thanks to a slimmed bezel.

At Apple’s annual WWDC conference earlier this year, the company introduced its smarter and more capable Siri AI assistant that will be coming to the newest Ultra models as part of its upcoming watchOS 27 release. The update will also include a redesigned app grid, improvements to health and fitness tracking, and battery life optimizations.