Apple released the second wave of developer betas for its 26‑generation OS suite, covering iOS 26.6, iPadOS, watchOS, tvOS, visionOS and macOS Tahoe 26.6. The builds replace the May 26 first betas and carry version identifiers such as 23G5043d for iOS and 25G5043d for macOS. Developers can now test refinements ahead of the upcoming fall release of the 27‑generation platforms.

The new betas focus on polishing performance and security rather than adding headline features. The earlier iOS 26.6 beta introduced a contacts limit warning and a Maps security fix, and the latest round continues that trend. Apple also issued two release‑candidate updates for macOS 15.7.8 and macOS 14.8.8, signaling readiness for final polish.

Apple advises against installing these builds on primary devices, recommending secondary hardware and full backups to avoid data loss. Users seeking a more stable experience can expect a public beta shortly after the developer release, offering a less volatile iteration for broader testing. The second developer round gives developers a chance to iron out issues before the next‑gen launch.