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.
Why it matters
High-performance container orchestration is critical for the scaling of AI agents and complex computational workloads in modern software development.
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 .
The article is a technical announcement from a company blog, focusing on engineering achievements.
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