Codex

OpenAI's terminal coding agent. The **harness** is the sandboxed tool-call loop with multi-provider support; the CLI is the shell. Reference implementation for "official CLI that ships code."

sandboxprovider-agnosticcli
Stars
133k
Adoption surface
slightly complex
Autonomy
bounded
Recovery
resumable
License
✅ open-source
Category
Coding agent products (IDEs, CLIs, full suites)

Repository ↗ Example: Sandboxing concept ↗

Related in Coding agent products (IDEs, CLIs, full suites)

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Best of Agent Harnesses

Paste this into your README so readers can find the list and see how Codex compares:

[![Best of Agent Harnesses](https://img.shields.io/badge/%F0%9F%8F%86_Best_of-Agent_Harnesses-5ac4bf)](https://github.com/RyanAlberts/best-of-Agent-Harnesses)