Apple Watch Series 12 and Ultra 4: health focus, S11 chip, Ultra battery up to 50 hours
Apple unveiled the Apple Watch Series 12 and Ultra 4, on sale September 18, 2026. Key upgrades include a new Health Sensing System with heart-rate readings every five seconds, a Readiness score, the S11 chip with Siri AI, and Ultra 4 battery life rising from 42 to 50 hours. Prices are unchanged at $399 and $799.
- Heart rate sampled every 5 seconds and HRV every 5 minutes — 60x and 24x more often than Series 11
- Ultra 4 battery life rises from 42 to 50 hours, with up to 45 hours of workout tracking
- S11 chip enables Siri AI and Audio Intelligence; Live Rewind and Siri Recap arrive in beta later in 2026
- Series 12 adds Ceramic Shield 2 and a ceramic case option; prices start at $399 and $799
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