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macOS 27.0 26A5378J

macOS 27 build 26A5378j is linked to the exact existing Beta 3 event; the build record does not imply a public release.

Full article
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Build identity

Release facts

Build number
26A5378J
Version
macOS 27.0
Appearances
1
Scope
General

Channel history

Recorded appearances

A build can appear in more than one channel. These entries stay separate instead of being collapsed.

  1. Beta 3

    Developer beta

    Appearance

Release notes

Release notes

Original editorial synthesis. Linked references appear with the claims they support and in the source ledger.

Build identity

The retained release evidence identifies 26A5378j as a macOS 27 prerelease build associated with Beta 3. The identifier is platform-scoped even when another operating system uses the same characters.[1]

Milestone relationship

This single build record links the existing Beta 3 route without duplicating a build document. The cited Apple release entry establishes the build and developer-beta milestone; it does not establish a public release.[1]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

  1. Apple Developer Releases — July 7, 2026 capture

    Apple Developer via Internet Archive · Apple · 2026-07-07T07:08:03.000Z · macOS 27.0 Beta 3; build 26A5378j

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