Apple's Claris previews Harbor, a private local AI server for Mac

Harbor's discovery came from in-code strings surfaced by leaker Aaron Perris and reported by 9to5Mac, rather than from an Apple announcement. The app's pitch is unusually plain: run open-weight models locally on Apple silicon, with data never leaving the hardware and nothing reaching the cloud. It also handles model management so users can focus on the work rather than the setup.

The clustering feature is the more unusual one. Harbor connects two or more Thunderbolt 5-capable Macs to pool their unified memory into a single inference resource, so a cluster can run larger models or serve more concurrent requests than any single machine could alone. The in-app copy says Harbor automatically detects devices over Thunderbolt 5 to form a cluster, with no manual configuration, command line, or infrastructure expertise required.

The choice of Claris rather than Apple Intelligence is the surprise. 9to5Mac's Ryan Christoffel writes that Harbor is in private preview under the Claris brand but seems likely to launch publicly in the weeks and months ahead. No release date or pricing has been disclosed.