| Case Size | 49mm titanium | — |
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| Display | Flat crystal, up to 3000 nits | Largest display of any Apple Watch (LTPO3, wide-angle OLED, borders 24% thinner), 1Hz Always-On refresh |
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| Chipset | Apple S9 SiP, 2nd-gen Ultra Wideband | — |
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| Battery | Up to 36 hours; up to about 60 hours in low-power mode | Up to 42 hours; up to 72 hours in Low Power Mode; 15 minutes of fast charging adds up to 12 hours |
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| Health Sensors | Heart rate, water temperature, sleep apnea detection, blood oxygen (calculated on paired iPhone) | Optical heart sensor with hypertension notifications, sleep score, ECG, blood oxygen, sleep apnea notifications, water temperature |
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| Water Resistance | WR100 / EN13319, recreational dives to 40 m | WR100; Oceanic+ dive computer app |
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| Connectivity | Cellular, dual-frequency GPS (L1 + L5) | 5G cellular, built-in two-way satellite communications, dual-frequency GPS |
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| OS | watchOS 10 (at launch) | watchOS 26 (requires iPhone 11 or later with iOS 26) |
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| Case | — | Titanium (natural, black), 100% recycled titanium, 3D-printed |
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