Apple Watch Series 12 and Ultra 4 bring hidden health and AI upgrades

Apple’s Series 12 and Ultra 4 smartwatches arrive with the same exterior silhouettes but introduce new aluminium, titanium and ceramic finishes, priced from ₹56,900 to ₹1,24,900. The core upgrade is a new health-sensing architecture that adds a five-second optical heart-rate sensor, expanded electrical sensors and brighter green LEDs, enabling heart-rate logging every five seconds and HRV monitoring every five minutes.

Powered by a 2-nanometer S11 chip and 4 GB of memory, the devices feel noticeably snappier and extend battery life, with the Ultra 4 offering up to 18 hours of use after a short charge. WatchOS 27 brings a refreshed Health app, full-day vitals view and upcoming deeper health updates. Siri AI now supports live-recap, contextual chat and sound-recognition, all processed on-device via the Secure Enclave to protect privacy. Overall, the hidden hardware and software improvements aim to deepen the watches’ role as health monitors and AI companions.