sandbox

SuperServe's landing page makes four promises. We drove the live API 356 ways across 24 test phases — booting every template, running nine agent runtimes, executing a multi-agent swarm — to map the gap between the spec sheet and the substrate.

Modal raised $355M at $4.65B selling AI agents a computer. So are 22 other companies. A map of the sandbox infrastructure race — who runs Firecracker, who doesn't, and why the substrate war is nearly settled while everything above it is wide open.