Apple has released the Release Candidate (RC) versions of iOS 26.6 and its other operating systems to developers, marking what is expected to be the final round of testing before the updates are made available to the public.
While Apples primary focus has shifted to the next-generation iOS 27 platform, the company continues to refine its current operating systems with the 26.6 update, which is centred on performance, stability and security improvements.
The Release Candidate follows five developer beta releases, with the first beta arriving on 26 May and subsequent builds rolling out through June and July.
Latest Release Candidate Build Numbers
iOS 26.6 RC Build 23G71
iPadOS 26.6 RC Build 23G71
watchOS 26.6 RC Build 23U67
visionOS 26.6 RC Build 23O770
tvOS 26.6 RC Build 23L772
macOS Tahoe 26.6 RC Build 25G70
HomePod Software 26.6 RC Build 23L772
Apple has also issued Release Candidate builds for older macOS versions:
macOS 15.7.8 RC 6 Build 24G822
macOS 14.8.8 RC 6 Build 23J619
Release Candidate versions are generally considered feature-complete and, unless critical issues are discovered, are typically the same builds that are released to the public.
As with previous maintenance updates, iOS 26.6 focuses primarily on bug fixes, security enhancements and overall system performance, while major new features are reserved for the upcoming iOS 27 release.
One notable addition introduced during the iOS 26.6 beta cycle is a Contacts notification that alerts users when they reach the maximum limit of 20,000 blocked contacts. The update also includes a security improvement affecting Apple Maps.
Apple continues to advise developers and testers against installing beta software on primary or mission-critical devices, as pre-release software may contain bugs that could lead to unexpected behaviour or data loss. Users are encouraged to back up important data and use secondary devices for testing whenever possible.
Apple Expands Silicon Valley Footprint with New Sunnyvale Office
Apple is continuing to expand its footprint in Sunnyvale, California, after signing a lease for a 125,800-square-foot office building, further strengthening its presence in Silicon Valley.
According to reports, the technology giant has agreed to lease the property located at 580 North Mary Avenue from Bay Area real estate firm Peery Arrillaga. While the financial terms of the agreement have not been disclosed, the lease is expected to represent a multi-million-dollar annual commitment.
Apple Continues Silicon Valley Expansion
The latest move follows Apple's established strategy of leasing office space before eventually acquiring the properties outright.
A recent example came in June, when Apple completed the purchase of an office building at 684 W. Maude Avenue in Sunnyvale after initially leasing the property in 2025.
The 194,624-square-foot building was acquired for approximately US$162.2 million, significantly below its previous US$222 million sale price recorded in 2022.
Ongoing Real Estate Investment
Apple has continued investing heavily in Silicon Valley real estate to support its growing workforce and long-term operations.
During 2025, the company also acquired a two-building campus on North Mathilda Avenue for approximately US$350 million, followed shortly by the purchase of an adjacent four-building Mathilda campus valued at around US$365 million.
While the newly leased Sunnyvale property remains under a rental agreement for now, Apple's recent real estate strategy suggests the company could ultimately move to purchase the building in the future, further expanding its extensive Silicon Valley campus network.
Apple Releases iOS 26.6 Release Candidate for Final Developer Testing
