Siri AI on Apple Watch: Which Models Are Supported and Why Older Hardware Is Being Left Behind
Apple's rollout of Siri AI for Apple Watch has stirred up a wave of confusion among loyal users who own older wearables. With the announcement of watchOS 27 at WWDC 2026, Apple introduced a powerful new version of Siri capable of deeper, more intelligent interactions directly from your wrist. The catch? Only a handful of Apple Watch models will actually get to use it — and Apple's explanation for why older models are excluded remains frustratingly vague.
What Is Siri AI on Apple Watch?
Siri AI is one of the headline features debuted at WWDC 2026 as part of watchOS 27. It represents a significant leap forward from the basic voice commands Siri has traditionally handled on the Apple Watch. The new version is designed to understand more nuanced requests, respond more naturally, and integrate more deeply with health and wellness features on the watch.
However, Siri AI on Apple Watch is not a standalone feature. It requires both a compatible Apple Watch model and a nearby iPhone that supports Apple Intelligence — Apple's broader suite of on-device AI capabilities. This dual-device requirement is notable, and it makes the exclusion of older Apple Watch models even harder to justify on the surface.
Which Apple Watch Models Support Siri AI?
Apple has officially clarified which devices are compatible with Siri AI on watchOS 27. According to statements made in a June 19 interview with TechRadar, Apple Watch and Health Product Marketing Manager Cait Dooley confirmed that the feature works best on newer hardware. The supported models are:
- Apple Watch Series 9 and later models
- Apple Watch Ultra 2 and later models
- Apple Watch SE 3
This means that users with Apple Watch Series 8, Apple Watch SE 2, and older devices will not have access to Siri AI, even when running watchOS 27. For many users who purchased their watches just a few years ago, this is a significant and disappointing limitation.
Why Are Older Apple Watches Being Excluded?
This is the question at the heart of the controversy, and it's one that Apple has not answered clearly. The company's official line — that Siri AI works best on newer hardware — is a non-answer that raises more questions than it resolves. Apple Watch Series 8, for instance, uses the same S8 chip as the Series 7, which was succeeded almost immediately by the S9 chip in the Series 9. The performance gap between the S8 and S9 chips is meaningful, but the explanation doesn't fully account for why a feature that offloads significant processing to a nearby iPhone cannot function at all on slightly older hardware.
What makes this especially puzzling is the reliance on a connected iPhone. Because Siri AI requires an Apple Intelligence-enabled iPhone to be nearby, a substantial portion of the computational heavy lifting is presumably being handled by the phone rather than the watch itself. If the iPhone is doing much of the work, the argument that older watches lack sufficient processing power becomes harder to sustain without more detailed technical explanation.
Apple has not provided chip-level documentation or performance benchmarks to back up its hardware requirement claims. For now, users and analysts are left speculating about whether the limitation is genuinely technical or whether it is at least partially a commercial decision designed to encourage upgrades.
The Broader Context: Apple Intelligence and Hardware Fragmentation
The exclusion of older Apple Watch models from Siri AI is part of a larger pattern that has emerged as Apple rolls out its Apple Intelligence platform. Apple Intelligence itself requires an iPhone 15 Pro, iPhone 16, or later — a requirement that similarly frustrated users with iPhone 15 base models and older devices. The pattern suggests Apple is drawing increasingly firm lines between its "AI-capable" hardware generation and everything that came before it.
For Apple Watch specifically, the shift feels abrupt. The Apple Watch Series 9 was released in September 2023, meaning that watches purchased as recently as 2022 are already being left out of a major feature cycle. As Apple continues to push AI functionality as a key differentiator in its ecosystem, the pace at which older devices lose access to marquee features is accelerating.
What This Means for Apple Watch Owners
If you currently own an Apple Watch Series 8 or earlier and were hoping to experience Siri AI through a watchOS 27 update, the news is clear: it won't be available to you. Your options are limited to either accepting that your device won't support the feature or upgrading to a supported model.
For those who are in the market for a new Apple Watch, the current lineup — including the Series 9, Apple Watch Ultra 2, and the upcoming Apple Watch SE 3 — all provide access to Siri AI when paired with a compatible iPhone running Apple Intelligence. If you plan to keep your watch for several years and want access to the latest AI-driven features, choosing from this supported tier is the prudent move.
Looking Ahead: Transparency and Trust
Apple's lack of a clear, technical explanation for the Siri AI hardware cutoff is not just a public relations problem — it erodes user trust in the long-term value of its devices. When customers invest hundreds of dollars in a product, they reasonably expect transparency about how long that product will receive meaningful software support and what limitations may be imposed down the line.
The TechRadar interview provided the first public acknowledgment of the issue, but a marketing manager citing "best performance on newer hardware" does little to satisfy technically curious users or those frustrated by the exclusion. Apple would benefit from offering a more detailed engineering explanation — whether that involves memory bandwidth constraints, neural engine architecture differences, or communication protocol requirements between the watch and iPhone.
Until then, the Siri AI cutoff on Apple Watch remains one of the more opaque hardware decisions Apple has made in recent memory — and a reminder that in the era of AI-driven software, the gap between supported and unsupported devices is growing wider with each new product cycle.