Apple's iOS 18.1 & iPadOS 18.1 developer beta 6 now available
To install iOS 18.1 beta 6, you must have an eligible device and enroll in the beta program (if you haven’t already). Remember that only the iPhone 15 Pro, iPhone 15 Pro Max, iPhone 16, and iPhone 16 Pro models support Apple Intelligence features. That said, you can check the firmware’s availability under Settings > General > Software Update.