Apple built the iPhone SE with the iPhone 6S in mind, not the 6. This means that the SE features more capable hardware than the 6, whether you’re talking sheer computing power or the camera.

Two Apple classics go head-to-head in a real-world speed and power challenge. This video compares the iPhone 6 and iPhone 6s ...

That means iPhone 6S, iPhone 7 and iPhone SE (first-generation) users won't be able to upgrade to iOS 16.