How to install Apple Intelligence beta on iPhone, iPad, and Mac: A step-by-step guide

Apple has released the first beta version of iOS 18.1, iPadOS 18.1, and macOS 15.1, which includes early access to Apple Intelligence features. Here’s how to install the beta and enable Apple Intelligence on compatible devices.
To install the Apple Intelligence beta, users need an iPhone 15 Pro or Pro Max, an iPad with an M1 chip or later, or a Mac with Apple silicon.