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Celesto is both a hosted platform and an open-source stack. The hosted platform gives you managed agent computers through an API. The open-source projects let you run, inspect, and extend the building blocks yourself. Use the hosted platform when you want to ship quickly. Use the open-source projects when you want local control, deeper customization, or a self-managed runtime.

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Choose the hosted platform

Hosted Celesto is the fastest path when your product needs managed computers for agents:
  • create computers from SDKs or the CLI,
  • run commands and publish ports,
  • keep durable state across sessions,
  • deploy agents without managing VM infrastructure,
  • integrate with OpenAI agent sandbox flows.

Celesto Platform

Start with hosted Celesto computers from Python, TypeScript, JavaScript, or the CLI.

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Choose open source

The open-source stack is useful when you want to run locally, inspect internals, or build your own agent runtime.

SmolVM

Open-source microVM sandboxes with fast boot and hardware-level isolation.

SmolFS

Durable workspace folders that agents can close and reopen across runs.

Agentor

Build agents with tool use, MCP, and agent-to-agent communication.

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You can mix both

Many teams use local SmolVM during development and hosted Celesto in production. The core idea stays the same: agents work inside computers, not on your app server.
Last modified on July 1, 2026