Modal has acquired Butter, a San Francisco-based AI sandbox technology startup. Butter founder Erik Dunteman and researcher Raymond Tana will join the Modal Sandbox team. The Butter team brings expertise in agent harness engineering, computer-use agents, deterministic memory systems, and codegen. Their most recent project, bVisor, is a virtual Linux kernel built in Zig for lightweight, ephemeral sandboxes. The acquisition aims to make Modal Sandboxes a best-in-class product.
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