All the Unix histories say Multics failed. It's no longer around of course, and was certainly not as successful as Unix. However, it did largely meet its goals, and was deployed for decades for mission-critical applications.
Multics MR12.9 is under active development. The current release is MR12.8, released August 8, 2023: https://multics-wiki.swenson.org/. While Multics no longer commercially supported, many of the current developers were previously involved with the project from its time at MIT and Honeywell Bull.
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See https://dps8m.gitlab.io/ for more information.