It could be that macOS 27 never got Unix certified. Wayback Machine on Oct 7th only shows macOS 26 being Unix certified.
https://web.archive.org/web/20261007103902/https://www.openg...
It could be that macOS 27 never got Unix certified. Wayback Machine on Oct 7th only shows macOS 26 being Unix certified.
https://web.archive.org/web/20261007103902/https://www.openg...
27 wasn’t certified and 26 was listed but is now removed.
From that Wayback page, it looks like only one version of macOS is certified at any one time: the latest version. Since macOS Golden Gate was only recently released, perhaps it's a process blip and we'll see Golden Gate listed soon.
Nope, Sequoia and Tahoe both remain registered: https://www.opengroup.org/openbrand/register/apple.htm
26 is in UNIX 03, if you use the pulldown