Build an AI coding platform that scales to millions of monthly sessions

Modal Vibe is a demonstration platform built on Modal Sandboxes to show how AI-generated or “vibe-coded” applications can be securely run and managed at large scale. It consists of a sandbox manager, a web frontend, and a fleet of isolated runtimes, avoiding the operational complexity often associated with orchestrators such as Kubernetes or Nomad. Modal claims its infrastructure can start sandboxes in seconds, launch thousands per second, and support tens of thousands concurrently, with built-in monitoring and dashboards. In a test that included AI code-generation time, the platform created one app in about 30 seconds, 10 in 60 seconds, 100 in 150 seconds, and 1,000 separate sandboxed apps in roughly five minutes, with AI API latency becoming the primary bottleneck at scale. The project’s source code and a public deployment are available, though the company characterizes it as a demo rather than production-ready software and advises users to consult its documentation before deploying similar systems.

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