Pydantic Creator Open-Sources Monty: A Python Sandbox That Starts in 1ms
samuelcolvin · x · 2026-09-25
Samuel Colvin released Monty v1, a Python sandbox that cold-starts in 1 millisecond instead of 1.5 seconds. He ran 10,000 sandboxed scripts in 674ms — a task that would take a cloud sandbox over 3 hours.
The pitch: removing the biggest drawback of letting agents write code. Monty is open source, installable via PyPI, npm or Crates; it supports long-lived sessions and can be dumped/resumed at any external function call. A hosted platform is coming soon, with design partners being recruited.
Related event: Pydantic Creator Open-Sources Monty, a Python Sandbox with 1ms Startup(5 posts)→
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