tl;dr: Apple is reportedly developing a Mac app called Harbor, discovered by leaker Aaron Perris, that turns Macs into private AI inference servers for running open-weight models locally on Apple silicon. The app supports clustering multiple Macs over Thunderbolt 5 to pool unified memory, allowing larger models and higher concurrency than a single machine could handle. Harbor is currently in private preview under Apple's Claris brand, with a public release expected in the coming months.