Monty v1 open-sourced: Python sandbox starts in 1ms, runs 10k scripts in 674ms
samuelcolvin · x · 2026-09-25
Pydantic author Samuel Colvin released Monty v1, an open-source Python sandbox that starts in 1 millisecond instead of 1.5s, targeting the biggest pain point of letting AI agents write code.
Key points:
- Benchmarked 10k sandboxed scripts in 674ms — a task he says would take a cloud sandbox over 3 hours.
- Supports long-lived sessions: Monty can be dumped and resumed at any external function call, useful for stateful agents.
- Installable via PyPI, npm, or Crates; a hosted platform is coming and design partners are being recruited.
The same post also surfaces OmniCoreAgent, an open Python agent runtime for production with tools, MCP, memory, workspace, telemetry, subagents, background tasks, and OmniServe APIs.
Related event: Pydantic Creator Open-Sources Monty, a Python Sandbox with 1ms Startup(5 posts)→
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