Apple Seeds iOS and iPadOS 26.6 Developer Preview Beta 4 to Testers
Apple released iOS and iPadOS 26.6 Developer Preview Beta 4 to enrolled testers on Tuesday, exactly one week after Beta 3.
The build number is 23G5057c. Apple doesn’t publish release notes for developer preview betas immediately — the company typically posts detailed changelogs after the initial rollout. Beta 4 follows a steady weekly cadence: Beta 3 landed on June 30, Beta 2 on June 16, and the first Beta on May 27.
For developers enrolled in the Apple Developer Program, the update is available through Settings > General > Software Update. Public beta testers can access the build by registering for the Apple Beta Software Program and enabling beta updates under the same menu path.
iOS 26.6 is a mid-cycle refinement release sitting between last fall’s iOS 26 launch and the upcoming iOS 27 major update, which is already in testing. The 26.x series has focused on stability improvements and under-the-hood performance optimizations rather than headline features. Given the 26.6 branch’s incremental version number, Beta 4 is unlikely to introduce major interface changes — the emphasis will be on squashing remaining bugs before the release candidate surfaces.
The 26.6 release cycle has tracked closely with Apple’s typical minor-update schedule. Recent milestones in the iOS 26 release history include:
| Date | Release |
|---|---|
| June 30, 2026 | iOS 26.6 Beta 3 (23G5052d) |
| June 16, 2026 | iOS 26.6 Beta 2 (23G5043d) |
| May 27, 2026 | iOS 26.6 Beta 1 (23G5028e) |
| April 28, 2026 | iOS 26.5 Beta 4 (23F5069b) |
| March 25, 2026 | iOS 26.4 (23E246) |
| September 16, 2025 | iOS 26 (23A341) |
Apple is expected to ship the iOS 26.6 release candidate within the next few weeks, with a public release likely following shortly after. Meanwhile, iOS 27 — the next major version — is already in developer beta testing with its own set of new features.