Every year the Apple Watch Ultra arrives with a spec sheet that reads like a shrug and a real-world change buried inside it. The Ultra 4, unveiled at Apple Park overnight, is the sharpest example yet. There is no redesign. The 49mm titanium case carries over untouched from the Ultra 3, the display is the same, and the Australian price actually comes down 50 bucks to $1,349.
Read that and you would call it a quiet year. You would be missing the one number that matters.
The Ultra 4 now delivers 18 hours of continuous GPS recording. For the first time in the line's history, that clears a full Ironman, swim, bike and run in a single session, without dipping into Low Power Mode. On top of it sit two new endurance modes: Extended Workout tracking runs to 25 hours, and Max Extended Workout stretches to 45 hours, enough to cover a 100-mile race by Apple's own reckoning. The Ultra has always carried more GPS endurance than most owners will ever spend, but this is the threshold the whole line has been building toward since 2022. It is the difference between a watch that can theoretically last an ultra-endurance day and one that can actually record every metric across it, at full fidelity, start to finish.
Underneath sits the S11, powering an all-new Health Sensing System with redesigned optical and electrical heart sensors. Background heart rate readings now arrive every five seconds, while heart rate variability — a useful indicator of stress and recovery — is measured as often as every five minutes. The new readiness score translates your recent activity, sleep and vitals into advice on how hard to push, updating throughout the day. Potentially useful for anyone whose training plan routinely fails to account for Thursday night.
The exercise features get some attention, too. Enhanced Workout Buddy delivers spoken updates on pace, distance and progress without needing your iPhone along, while improved step tracking promises more accurate everyday counts and distance measurements. Away from training, Apple claims up to 50 hours of normal use and 84 in Low Power Mode; a 15-minute charge buys up to 18 hours of use.
Siri AI also promises more conversational exchanges from your wrist, while the forthcoming Siri Recap turns conversations into summaries and key points. That last feature arrives in beta later this year, so it belongs in the “coming soon” column of the purchasing decision.
The endurance piece is Apple's real argument against Garmin lives. The Garmin fenix 9 was announced on 25 August at $1,749, $400 more, and it will out-endure the Ultra 4 on raw battery. But Apple is not competing on days of standby. It is betting that a health and AI layer a pure GPS watch cannot match is the edge that keeps serious Apple-ecosystem athletes from defecting.
The big talking point this year is what did not ship. Blood pressure readings have been telegraphed for two years, and the Ultra 4 still stops at the hypertension notifications introduced on the Ultra 3. If quantified blood pressure had landed, this would be a different, bigger story. Its absence makes the Ultra 4 a refinement rather than a leap, and it likely reserves that headline for the Ultra 5.
Aussie pre-orders are now open and the watch reaches stores on September 18.