Fable 5.2 coordinates 1,000+ subagents for 8 days to build a bootable OS
haider1 · x · 2026-11-10
In an Anthropic experiment, an engineer tasked Fable 5.2 with designing a prototype OS. Starting from an empty folder, the model coordinated over 1,000 subagents around the clock for eight days, writing, testing, and reviewing its own code. The result boots on a real laptop, with a kernel, disk/keyboard/network drivers, persistent storage, windows, a login screen, an installer, and built-in Claude functionality — a landmark demo of long-horizon multi-agent engineering.
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