Open Group's UNIX Register Page Omits macOS, but Both Tahoe Certificate Pages Still Load

The Open Group's public UNIX register page listed no Apple entry when checked on Oct. 11, yet the two certificate pages for macOS 26.0 Tahoe still load and carry no withdrawal note. A Hacker News thread titled "Apple/macOS removed from official Unix registry" reached 250 points and 218 comments on Oct. 10 by treating the first fact as the whole story.

The register is the Open Group's list of products certified to its UNIX trademark. The register page as served on Oct. 11 listed nine products, and none was from Apple.

What the register page showed on Oct. 11

Product	Vendor
z/OS 3.1 or later	IBM
AIX 7 (7.2 TL5 or later)	IBM
AIX 7 (7.1 TL5 or 7.2 TL2 or later)	IBM
HP-UX 11i V3 Release B.11.31 or later	Hewlett Packard Enterprise
AIX 6 V6.1.2 with SP1 or later	IBM
AIX 5L for POWER V5.3	IBM
z/OS V2R1 or later	IBM
UnixWare 7.1.3 and later	The SCO Group
SCO OpenServer Release 5 and Release 6	The SCO Group

The page gives no per-entry specification or expiry date. It does offer a "Filter by Standard" menu with UNIX 03 among the options.

The Tahoe certificate pages still resolve

Individual brand pages tell a different story. Brand 3725 lists Apple Inc., "macOS version 26.0 Tahoe," on Apple silicon Macs, registered on Aug. 29, 2025 against the UNIX 03 product standard, with certificate 1223p. Brand 3720 is the Intel build, registered the same day, with a certificate link that points to 1224p.

Neither page mentions a status, an expiry or a withdrawal. A MacGeneration report by Anthony Nelzin-Santos, published Sept. 15, 2025, said Tahoe had received the certification in both its Apple silicon and Intel versions.

The register pages carry no notice explaining the front-page difference. Which of the two views is stale is not something the pages answer.

What the Hacker News thread concluded

Most commenters doubted a removal. The user nsagent called it "much ado about nothing" and "just a site rendering issue." Another, jasoneckert, reported that Tahoe appears under UNIX 03 when the filter is used, but only AIX appears under UNIX V7, so "different parts of the website aren't necessarily in sync."

Another reading came from the user dofm, who suggested the index lists only current operating-system versions and that the next macOS release "simply hasn't passed certification yet" and is "less than a month old." The thread's original poster asked whether macOS 27 had been listed and then removed. Nobody in the portion read cited a dated Open Group notice either way.

Those are commenters' guesses, not Open Group statements. The Terminal could not confirm a removal, a delay or a display bug from the register itself.

Why the certification was already contested

The certificate has been argued over for longer than this week. In January 2025, OSnews writer Thom Holwerda wrote that Apple's conformance statements show macOS 15.0 meets UNIX 03 only after steps almost no user takes, including turning off System Integrity Protection and enabling the root account. He called the certification "a lie."

MacGeneration made a similar point about Tahoe, writing that Apple meets the Single UNIX Specification version 3, which dates to 2001, only if SIP is disabled. Both accounts describe what Apple's paperwork requires, not what a stock Mac does.

For a developer the practical question is narrow. Nothing on the two Tahoe pages changes how a Mac runs scripts or compiles code. For a procurement team that needs a registered UNIX product on a list, the question is whether the front page or the brand pages are authoritative, and the register does not say.

Platform news elsewhere this week was more concrete: Python 3.15.0 shipped on Oct. 9, and Cloudflare set a one-year end date for Deno's runtime. The register page is next worth checking when Apple publishes its next macOS version, which would show whether a new entry appears.