Codex, open source coding agent, OpenAI Inc., San Francisco, California, USA

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Developer - OpenAI Inc.

openai.com/codex

github.com/openai/codex

"OpenAI Codex CLI – Getting Started"

OpenAI Codex on Wikipedia

 

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OpenAI Codex CLI

Apr 16, 2025

Meet Codex CLI—an open-source local coding agent that turns natural language into working code. Tell Codex CLI what to build, fix, or explain, then watch it bring your ideas to life. In this video, Fouad Matin from Agents Research and Romain Huet from Developer Experience give you a first look and show how you can securely use Codex CLI locally to quickly build apps, fix bugs, and understand codebases faster. Codex CLI works with all OpenAI models, including o3, o4-mini, and GPT–4.1.

 

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Article "OpenAI debuts Codex CLI, an open source coding tool for terminals"

by Kyle Wiggers
April 16, 2025

 

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producthunt.com/posts/openai-codex-cli

 

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"Introducing Codex"
A cloud-based software engineering agent that can work on many tasks in parallel, powered by codex-1. Available to ChatGPT Pro, Team, and Enterprise users today, and Plus users soon.

May 16, 2025

 

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Article "OpenAI hires the team behind Xcode coding assistant Alex"

by Ivan Mehta
September 5, 2025

Daniel Edrisian

 

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Article "OpenAI upgrades Codex with a new version of GPT-5"

by Maxwell Zeff
September 15, 2025

 

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"Codex is now generally available"

October 6, 2025

 

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OpenAI Codex in your code editor

Oct 17, 2025

Use Codex right in your code editor with the new IDE extension for VS Code, Cursor and other forks.

In this video, Gabriel Peal and Romain Huet show you how to explore code, implement new features, and brainstorm front-end design ideas for their app.
Timestamps:

00:00 Intro
00:45 Exploring the codebase
01:20 Implementing hover states
02:40 Moving tasks to Codex cloud
03:23 Brainstorming new designs with Codex
04:20 How Codex changed Gabriel’s workflow
05:30 Reviewing Codex’s work