Apple Watch S12 and Ultra 4 turn into AI hubs with Siri AI and Live Rewind
APPSO · wechat · 2026-09-10
APPSO breaks down the new Apple Watch lineup: Series 12 from 2,999 yuan and Ultra 4 from 6,499 yuan, shipping September 18. Both run the S11 chip with a rebuilt sensor system (HRV sampling up to 24x more frequent) and a new "Readiness" score that fuses training load, vitals and sleep. The AI push is the headline: Siri AI arrives on-wrist with cross-device conversation handoff, while Audio Intelligence adds Live Rewind (transcribing the last 15 seconds of speech) and Siri Recap notes. Raw audio is processed in the S11's Secure Exclave and immediately deleted. Siri AI and the audio features are not available in mainland China at launch and require Series 12/Ultra 4 with iPhone 16 or later.
Related event: Apple Unveils Apple Watch Ultra 4 and Series 12(2 posts)→
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