MacRumors has reported that Apple has rolled out the sixth developer betas of iPadOS 18.1 and iOS 18.1.
Apple Seeds Sixth Developer Betas of iOS 18.1 and iPadOS 18.1 With Apple Intelligence [Update: Public Beta Available]
Apple today provided developers with the sixth betas of iOS 18.1 and iPadOS 18.1 to continue testing Apple Intelligence features. The fifth betas come two weeks after Apple seeded the fifth iOS 18.1 and iPadOS 18.1 betas.
The updates can be downloaded from the Settings app on a compatible device by going to General > Software Update. Note that Apple Intelligence features still an iPhone 15 Pro or iPhone 16 to run.