Kubernetes won the container decade. Google’s Agent Substrate wants the next one.

The New Stack · 22 hours ago

Google released GKE Agent Sandbox to general availability in May 2026 and introduced Agent Substrate, a separate scheduler designed for AI agents because Kubernetes was built for long-running services rather than the bursty, mostly-idle workloads that agents represent. Agent Substrate achieves 30x or more oversubscription with sub-second activation by snapshotting idle sessions to storage and multiplexing them onto pre-warmed worker pods, while Agent Sandbox provides kernel isolation via gVisor for running untrusted model-generated code at 300 sandboxes per second with 90 percent finishing in 200 milliseconds. The emergence of this dedicated agent runtime as a fourth compute offering alongside virtual machines, containers, and serverless indicates that the infrastructure layer for managing agents is consolidating into specialized systems separate from general container orchestration.