A claimed device compatibility list for watchOS 26 indicates that the upcoming update will support the same models as the current Apple Watch software.
If your Apple Watch runs watchOS 11, it should be compatible with watchOS 26

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A claimed device compatibility list for watchOS 26 indicates that the upcoming update will support the same models as the current Apple Watch software.
watchOS 26 should support third-party widgets in the Control Center, allowing the Apple Watch to go beyond Apple's built-in toggles and tiles for the first time ever.
Try these troubleshooting tips if your iPhone does not display a battery notification when your Apple Watch is fully charged.
Solid-state buttons with haptic feedback response and no moving parts may supplant physical buttons on future iPhone, iPad and Apple Watch models.
If you’re looking to save a little money but still want the best of the best of Apple device accessories from the popular Nomad brand, then we’ve got some good news for you. Nomad has just launched an Open Box section where like-new accessories can be purchased for less than retail.
Apple's iPhone, iPad and Mac software design overhaul will extend to the Apple Watch and Apple TV with the upcoming watchOS 12 and tvOS 19 updates.
Apple has allegedly cancelled work on camera-equipped Apple Watch and Apple Watch Ultra models that it originally planned to bring to market in 2027.
Learn how to fix the low speaker volume problem on your Apple Watch and enjoy the loud, clear audio again instead of inaudible calls that sound like the speaker is blown.
Apple unveiled new accessibility features coming to the iPhone, iPad, Mac, Apple Watch and Vision Pro this fall with iOS 19 and other software updates.
Work on future AirPods and Apple Watch models featuring built-in cameras seems to be picking up steam, with launches expected sometime in 2027.
Read the full watchOS 11.5 release notes from Apple to learn about the new features, fixes and other changes in this Apple Watch update.
Boost Mobile cellular subscribers can now add Apple Watches and iPads to their cellular plans, aligning the MVNO (Mobile Virtual Network Operator) with other cellular carriers that have long offered these products in their cellular subscription services.