Apple’s latest explanation for Siri AI on Apple Watch identifies which models support the feature, but it still doesn’t explain why older watches are excluded despite requiring a nearby Apple Intelligence-enabled iPhone.
A June 19 interview with TechRadar offered Apple’s first public response to questions about the cutoff. Apple Watch and Health Product Marketing Manager Cait Dooley said Siri AI and other watchOS 27 features work best on newer hardware.
Apple specifically pointed to Apple Watch Series 9 and later models, Apple Watch Ultra 2 and later models, and Apple Watch SE 3.
WWDC 2026 introduced Siri AI as part of watchOS 27. The feature requires both a supported Apple Watch and a nearby Apple Intelligence-enabled iPhone, with support beginning on Apple Watch Series 9.
TechRadar asked Apple why older Apple Watch models don’t qualify. Dooley said Apple makes power and performance a priority with every software release and repeated that Siri AI works best on newer hardware.
Her answer clarified the compatibility list, but it stopped short of explaining the technical reason behind the cutoff.
Apple drew a clear compatibility line
Siri AI on watchOS 27 supports the following models.
- Apple Watch SE 3
- Apple Watch Series 9
- Apple Watch Series 10
- Apple Watch Series 11
- Apple Watch Ultra 2
- Apple Watch Ultra 3
Older models don’t make the cut.
- Apple Watch SE 2
- Apple Watch Series 6
- Apple Watch Series 7
- Apple Watch Series 8
- Apple Watch Ultra
Apple Watch Series 8 and the first-generation Apple Watch Ultra use the S8 chip, which includes a 2-core Neural Engine. Apple Watch Series 9 introduced the S9 system-in-package with a 4-core Neural Engine that handles machine learning tasks up to twice as fast as the S8.
The newer chip also brought on-device Siri processing and support for the double tap gesture. The hardware gap between supported and unsupported models provides one possible explanation for Apple’s compatibility cutoff.
TechRadar goes further than Apple
After publishing Apple’s comments, TechRadar offered its own interpretation. The publication wrote that “it’s likely only Apple Watches running Apple’s powerful S9 and S10 chips can handle the technical demands of Siri AI.”
Apple didn’t make that claim.
The company’s explanation and TechRadar’s conclusion aren’t the same thing. Apple may have technical reasons for limiting Siri AI to newer watches, likely the on-device Siri processing, but its current public statements don’t identify what those reasons are.
Apple’s own requirements make the Siri AI cutoff harder to evaluate because the feature isn’t being presented as a standalone Apple Watch capability. A paired iPhone does the heavy lifting for computational needs.
Apple Watch owners now have a compatibility list and a broad performance explanation. A technical explanation for why Siri AI begins with the Apple Watch Series 9 generation hasn’t arrived yet.


