Scaling to 1M concurrent sandboxes in seconds
Modal has rebuilt its infrastructure to support the creation of one million concurrent sandboxes in under a minute. This upgrade aims to remove bottlenecks for users running large-scale AI agents and reinforcement learning tasks.
All posts Back Engineering July 16, 2026 • 10 minute read Scaling to 1 million concurrent sandboxes in seconds Colin Weld Member of Technical Staff Connor Adams Member of Technical Staff At Modal, we build sandboxes, among other things. Agents run in sandboxes, and agents are eating software. Today, Modal runs millions of sandboxes per day, supports up to fifty thousand concurrent sandboxes per customer, and supports a variety of use cases at scale, from reinforcement learning to background agents .
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