Modal Sandboxes are generally available

Modal has announced the general availability of Sandboxes, an isolated execution environment designed to safely run untrusted code from LLMs, users, or third parties without exposing a customer’s Modal workspace or infrastructure. Sandboxes support arbitrary languages, runtime-configurable dependencies through Modal’s Image API, filesystem snapshots for persistent and parallelized workloads, and controls for networking, ports, and file access. Built on the same infrastructure as Modal Functions, they offer fast cold starts, GPU availability, global region selection, and integration with existing Modal applications. Customers including SWE-bench, Quora’s Poe platform, Codegen, and Relevance AI use Sandboxes for parallel agent evaluations, secure interactive coding, AI-driven code refactoring, and automated workflows, with Modal reporting tests of creation throughput up to 1,000 Sandboxes per second.

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