Siri AI leaves older Apple Watches behind without a clear reason

Apple says Siri AI on watchOS 27 works best on newer hardware, and it has now published a model-by-model compatibility list. But when asked why older Apple Watch models are excluded—despite the feature only working with a nearby Apple Intelligence-enabled iPho

For owners of older Apple Watches, the promise of Siri AI has started to feel like a door that only opens partway. Apple’s support page and watchOS 27 rollout outline where the feature works—and where it doesn’t—without answering the question people are actually asking: why.

In a June 19 interview with TechRadar. Apple Watch and Health Product Marketing Manager Cait Dooley offered the first public response to concerns about Siri AI’s cutoff. Dooley said Siri AI and other watchOS 27 features work best on newer hardware. Apple’s explanation, she repeated, comes down to priorities around power and performance with each software release.

Apple then drew a clear line on which watches qualify for Siri AI. Support begins on Apple Watch Series 9 and later models, and includes:

– Apple Watch SE 3
– Apple Watch Series 9
– Apple Watch Series 10
– Apple Watch Series 11
– Apple Watch Ultra 2
– Apple Watch Ultra 3

On the flip side, older models “don’t make the cut,” including:

– Apple Watch SE 2
– Apple Watch Series 6
– Apple Watch Series 7
– Apple Watch Series 8
– Apple Watch Ultra

That compatibility list matters more because Siri AI on watchOS 27 isn’t a lone feature on the watch by itself. Apple’s requirements are explicit: Siri AI needs both a supported Apple Watch and a nearby Apple Intelligence-enabled iPhone. And Apple support is framed around that pairing rather than a standalone capability on older wearables.

watchOS 27 is where Siri AI first shows up for Apple Watch users. following WWDC 2026 where the feature was introduced as part of the software update. The feature’s iPhone pairing requirement is where the stakes get tricky for older-device owners. If the iPhone is doing the heavier lifting for computational needs. the exclusion of earlier watches feels harder to justify—at least based on what Apple has chosen to say publicly.

Apple’s own hardware differences offer one possible explanation. even though the company hasn’t pinned the blame on a specific technical limitation. The company points out that Apple Watch Series 8 and the first-generation Apple Watch Ultra use the S8 chip. which includes a 2-core Neural Engine. By contrast. Apple Watch Series 9 introduced the S9 system-in-package with a 4-core Neural Engine designed to handle machine learning tasks up to twice as fast as the S8.

Apple also ties newer hardware to Siri AI’s broader behavior. The newer chip brings on-device Siri processing and support for the double tap gesture.

Still, the missing piece is the “why older watches” part. After Apple’s comments were published. TechRadar went further with its own interpretation. writing that “it’s likely only Apple Watches running Apple’s powerful S9 and S10 chips can handle the technical demands of Siri AI.” Apple did not make that claim.

That difference matters: the compatibility list and Apple’s repeated focus on performance don’t spell out the technical reason behind the cutoff. and they leave owners with the same unanswered gap. The feature isn’t presented as a standalone Apple Watch ability. because a nearby Apple Intelligence-enabled iPhone is part of the setup—so any limitation has to be understood in that paired system.

At the moment, Apple has given watch owners a straightforward answer about which models work—starting with Apple Watch Series 9. But a technical explanation for why Siri AI begins with that generation hasn’t arrived yet. For users holding older Series and Ultra hardware. the result is a clean list of supported devices paired with a frustratingly unclear line in the sand.

Apple Watch Siri AI watchOS 27 Apple Intelligence Cait Dooley compatibility list older models S8 chip S9 chip Neural Engine