Apple has released the second public betas of macOS Sequoia 10.5, iOS 18.1, and iPadOS 18.1. They have some of the announced Apple Intelligence features.
Public betas are available on Apple’s Beta Software Program website. Just remember that beta software is unfinished software, so proceed with care.
Apple does public betas in order to increase the size of the pool of testers. The tech giant recommends keeping back-ups of your files before installing a public beta.