Release candidate
RC
Source-linked recordSources linked
- Build
24H16- Availability
- available
- Sources
- 2 linked
Release record
macOS 15.8
macOS Sequoia 15.8 is a point release on the legacy macOS 15 train. It entered release-candidate testing on August 17, 2026 and had not reached general availability on that date. Apple's release notes describe it as providing important security fixes recommended for all users.
Source-linked record
Cycle active
- Latest milestone
- RC
- Last recorded
- Aug 17, 2026
- Next forecast
- Public release
- Recorded milestones
- 1
Methodology-backed forecast
Public release
Aug 23, 2026 – Aug 24, 2026
- Historical median
- Aug 23, 2026
- Comparable cycles
- 12
- Label agreement
- 75%
Calculated from comparable completed cycles. This is not an Apple announcement.
Chronology evidence
Version sources
These sources support version-level chronology or metadata. A researched version overview has not been added.
- Apple rolls out macOS Tahoe 26.7 and macOS Sequoia 15.8 RCs
9to5Mac · 2026-08-17T00:00:00Z · macOS Sequoia 15.8 (24H16); release candidate, August 17, 2026
- Apple Releases macOS 27 Beta 6, Plus Release Candidates for Tahoe and Sequoia [Download]
iClarified · 2026-08-17T00:00:00Z · macOS Sequoia 15.8 (24H16); release candidate, August 17, 2026
Milestones
Release history
Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.
Historical context
Cycle comparison
Pace, intervals, and duration compared with earlier releases on the same platform.
Historical avg for .8 releases
160 days, 2.0 milestones
Based on 1 previous macOS .8 releases
Pace at day 1
1 milestones (avg: 1.0)
In line with pace — previous .8 releases averaged 1.0 milestones at this point
Previous .8 releases (macOS)
| Version | Year | Cycle | Milestones | Avg. Interval |
|---|---|---|---|---|
| macOS 10.8 | 2012 | 160d | 2 | 160d |
Scroll horizontally to compare every historical field.