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On October 19, 2026, the official Modal engineering blog published a post introducing that Legora places each evaluation run in an independent Modal Sandbox; a single experiment can run more than 2,000 times in parallel, used to test legal agents that span thousands of documents and run for several hours. The team uses Modal Volumes to snapshot documents, databases, and permission states, and by building images hourly and pre-warming Sandboxes, shortens reset-to-commit from a full build to an incremental update. After migrating to Modal VM Sandboxes, Docker works inside the sandbox like an ordinary Linux host, and Legora removed all of its previous network and FUSE workarounds.
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How Legora runs 2,000 agent evaluations in parallel on Modal SandboxesDevelopments
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Legora uses Modal Sandboxes to run 2,000 agent evaluations in parallel
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Oct 19
Modal Official Engineering BlogFirst-party
How Legora runs 2,000 agent evaluations in parallel on Modal Sandboxes
Legora puts each evaluation run in an independent Modal Sandbox, allowing a single experiment to run more than 2,000 times in parallel to test legal agents that span thousands of documents and run for hours. The team uses Modal Volumes to snapshot documents, databases, and permission state, and shortens reset-to-commit from a full build to an incremental update by building images hourly and pre-warming Sandboxes. After migrating to Modal VM Sandboxes, Docker works inside the sandbox like on an ordinary Linux host, and Legora removed all of its previous networking and FUSE workarounds.