Google Cloud Run vs Agent Sandboxes: Where They Differ and Which One to Pick
Blog post from Upstash
The comparison between Google Cloud Run sandboxes and Upstash Box highlights different approaches to running untrusted, model-generated code securely and efficiently. Cloud Run sandboxes, introduced in public preview in July 2026, integrate as a code-execution feature within existing Cloud Run services, offering a default ephemeral environment that shares CPU and memory with the service, and is well-suited for those already using Google Cloud Platform (GCP). In contrast, Upstash Box is a standalone sandbox product that acts as a persistent computer with its own filesystem and network stack, designed for agent workloads that require long-lived states and more granular security controls, such as domain-specific egress policies and secret injection without exposure. While Cloud Run sandboxes incur no additional cost beyond existing service billing, their cost model is tied to the service's lifecycle and request handling, whereas Upstash Box charges only for active CPU usage, offering potential cost savings for workloads that involve significant idle time. Ultimately, Cloud Run sandboxes are ideal for those already integrated into GCP needing a safe code execution feature, while Upstash Box is better suited for building agent products requiring enduring state, flexible security, and independent lifecycle management.
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