The OpenAI Agents API, open source and self-hosted. Run Codex, Claude Code or MiniMax Code on your own machines with your own models, through the official OpenAI SDK.

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• Same API as OpenAI. Set OPENAI_BASE_URL and the official OpenAI SDK, or plain HTTP, works unchanged.
• Your agent, your model. Each Session runs Codex, Claude Code or MiniMax Code natively, as it runs on your machine, with the model provider you configure. See Harness capabilities.
• Compute that sleeps, workspaces that stay. On microsandbox, which keeps every workspace on independent storage, idle sandboxes release compute and resume on a compatible node with their files intact. E2B, Docker and your own Linux, macOS or Windows machine also run Sessions. See Sandbox Provider protocol.
• Replaceable parts. Sandbox Providers, workspace filesystems, Harnesses and model providers plug in through defined protocols.

Quickstart

Install Core, Web and PostgreSQL on Linux or macOS with Docker:

curl -fsSL https://openagentcore.dev/install.sh | bash

On Windows, in PowerShell:

irm https://github.com/MiniMax-AI/OpenAgentCore/releases/latest/download/install.ps1 | iex

In Web, sign in with the Core key the installer prints, configure the public address, set a default model, issue a Project API key and add sandbox capacity (a node or E2B). Install Core and Web covers each step.

Then call it with the OpenAI SDK, with OPENAI_BASE_URL set to your API base URL (https://core.example/v1) and OPENAI_API_KEY to the Project API key:

from openai import OpenAI

client = OpenAI()  # reads OPENAI_BASE_URL and OPENAI_API_KEY
session = client.beta.agents.sessions.create(
    environment={"type": "openai_hosted"},
    input="Create /workspace/hello.txt with a short greeting, then describe it.",
    extra_body={"agent": {"x_agents_core": {"harness": "codex"}}},
)
print(session.id)

Run your first Session waits for the result and reads it back.

How it works

Applications and operators use these Core APIs:

API	Path	Used by
Agents API	/v1	Your applications. Same protocol as OpenAI's Agents API
Core API	/core/v1	Operators, through Web

Core keeps durable execution state. The Runtime runs the chosen Harness inside the Environment. Each connection is a defined protocol, so any part can be replaced on its own. See Architecture.

Documentation

I want to	Start with
Install and operate an installation	Install Core and Web, then Operations
Build an application on the API	Run your first Session, then the Agents API guide
See a complete application	Examples
Run agents on my own machine	Run self-hosted Sessions
Check Harness capabilities and limits	Harness capabilities
Understand the design	Architecture
Add a sandbox, Harness or other component	Develop OpenAgentCore

Contributing and license

Read CONTRIBUTING.md before changing code. Report bugs and ask questions in GitHub Issues. Released under the MIT License.