Mac owners who have installed the latest public beta, which was released earlier today, may have the final version already on their machines.

The public beta — sixth in a series that started in late July — was identified as build 14A388b, which matches the number assigned to the third “golden master,” or GM, released Oct. 9 to registered developers.

Apple traditionally finalizes its OS X code several days before official release. Last year, for example, Apple generated the last GM two days before launching OS X Mavericks on Oct. 22.

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