As mentioned, only the iPhone 15 Pro models and iPhone 16 models can access Apple Intelligence. If you have a standard iPhone 15 or an older generation iPhone, you can (and should) still upgrade to iOS 18.1, but you won't be able to use the new Apple Intelligence features.
That's right, it's not on the 14. It won't EVER be on the 14. If you just want Apple Intelligence, then you'll just need to buy an iPhone which is capable of running Apple Intelligence. That means you need an iPhone 15 Pro/15 Pro Max or any of the new iPhone 16 models.
Apple Intelligence is available on iPhone 16, iPhone 16 Plus, iPhone 16 Pro, iPhone 16 Pro Max, iPhone 15 Pro, iPhone 15 Pro Max, iPad with A17 Pro or M1 and later, and Mac with M1 and later.
As mentioned, only the iPhone 15 Pro models and iPhone 16 models can access Apple Intelligence. If you have a standard iPhone 15 or an older generation iPhone, you can (and should) still upgrade to iOS 18.1, but you won't be able to use the new Apple Intelligence features.
Apple Intelligence is available with macOS Sequoia 15.1 or later on supported Mac models. For iOS 18.1 and later, and iPadOS 18.1 and later, Apple Intelligence will not currently work if you are in the EU and if your Apple Account Country/Region is also in the EU.
Apple Intelligence is available on iPhone 16, iPhone 16 Plus, iPhone 16 Pro, iPhone 16 Pro Max, iPhone 15 Pro, iPhone 15 Pro Max, iPad with A17 Pro or M1 and later, and Mac with M1 and later.
Supported devices: Apple Intelligence is available in iOS 18.1 or later on all iPhone 16 models, iPhone 15 Pro, and iPhone 15 Pro Max. Availability: Apple Intelligence is available with Siri and device language set to English in most regions around the world.
To get started with Apple Intelligence after you update your device, go to Settings, select Apple Intelligence & Siri, then select Get Apple Intelligence. After you select Get Apple Intelligence, on-device Apple Intelligence models will start downloading (time to download varies).