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How to use Codex: what you can do with it

What is Codex? Codex CLI is OpenAI's coding agent that runs locally on your computer. You install it with a script, npm or Homebrew, run `codex` in a project, and sign in with your ChatGPT plan or an API key. It also ships as an IDE extension and a desktop app started with `codex app`.

How do I use it? On macOS or Linux run curl -fsSL https://chatgpt.com/codex/install.sh | sh; then Or install with npm: npm install -g @openai/codex, or with Homebrew: brew install --cask codex; cd into your project and run codex. Full steps below.

3 people shared what they built with Codex. See what people are building

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What do you want to do?

3 use cases

What people are building with Codex

  • Built withHacker News

    Ported the epy terminal ePub reader from Python to Rust with Codex CLI and Claude Code

    A developer ported an unmaintained terminal e-book reader to Rust using Codex CLI and Claude Code. What looked like an afternoon took days of agent work, because rendering EPUB and navigating books in a terminal turned out to be hard.

    Codex on GitHub

    By dawdler-purge on Hacker News

    View original post on Hacker News

  • Built withHacker News

    Built Waku, a native Rust and GPUI desktop app that runs Codex CLI and other coding agents

    Frustrated with slow Electron apps, the author built Waku as an alternative GUI for Codex CLI and other command line coding agents, written in Rust with GPUI and shared as a Show HN.

    Codex on GitHub

    By 0x142857 on Hacker News

    View original post on Hacker News

  • Built withHacker News

    Built CC Meter, a Windows tray gauge for Claude Code and Codex usage limits

    CC Meter shows percentage used, reset time and pace for Claude Code and Codex limits in a small Windows tray widget. Codex usage is read from the installed Codex CLI app-server, and the source is MIT licensed.

    Codex on GitHub

    By silversurfer863 on Hacker News

    View original post on Hacker News

Real builds shared on X, Hacker News, Reddit, DEV and GitHub, summed up by Deduped from each post and its links; each card links to the original post. See what people are building with other repos

Quick start with Codex

  1. Check you have what it needs: macOS, Linux or Windows; A ChatGPT Plus, Pro, Business, Edu or Enterprise plan, or an OpenAI API key (extra setup); npm or Homebrew if you do not use the install script.
  2. Open openai/codex on GitHub and read the README and license.
  3. On macOS or Linux run curl -fsSL https://chatgpt.com/codex/install.sh | sh
  4. Or install with npm: npm install -g @openai/codex, or with Homebrew: brew install --cask codex
  5. cd into your project and run codex
  6. Choose Sign in with ChatGPT so usage counts against your Plus, Pro, Business, Edu or Enterprise plan

These steps come from our top use case, Install Codex CLI and run it on your repo with your ChatGPT plan, which also has a copy-paste agent prompt.

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Using the Deduped MCP, get the setup steps for openai/codex

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About this repo

  • Who it is forDevelopers who want an agent in the terminal that reads, edits and runs code in their own repo, paid for by a ChatGPT plan they already have.
  • Why it is hot131k stars, talked about in 2 AI sources we track
  • LanguageRust
  • Sourcegithub.com/openai/codex ยท Back to Hot repos

Requirements

  • macOS, Linux or Windows
  • A ChatGPT Plus, Pro, Business, Edu or Enterprise plan, or an OpenAI API key (extra setup)
  • npm or Homebrew if you do not use the install script

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Questions about Codex

What is Codex?

Codex CLI is OpenAI's coding agent that runs locally on your computer. You install it with a script, npm or Homebrew, run `codex` in a project, and sign in with your ChatGPT plan or an API key. It also ships as an IDE extension and a desktop app started with `codex app`. It is an open-source project on GitHub: https://github.com/openai/codex.

How do I use Codex?

On macOS or Linux run curl -fsSL https://chatgpt.com/codex/install.sh | sh; then Or install with npm: npm install -g @openai/codex, or with Homebrew: brew install --cask codex; cd into your project and run codex. The use cases on this page give the full steps and a copy-paste agent prompt for each job.

Who is Codex for?

Developers who want an agent in the terminal that reads, edits and runs code in their own repo, paid for by a ChatGPT plan they already have.

What can I do with Codex?

3 use cases so far, for example: Install Codex CLI and run it on your repo with your ChatGPT plan; Install Codex CLI on Windows with one PowerShell line; Use Codex inside VS Code, Cursor or the desktop app. Each has steps and a copy-paste agent prompt.

What do I need to run Codex?

macOS, Linux or Windows; A ChatGPT Plus, Pro, Business, Edu or Enterprise plan, or an OpenAI API key (extra setup); npm or Homebrew if you do not use the install script.

What are alternatives to Codex?

Other hot AI repos in Software and DevOps: Deep Infer, Harness2, Orca, Opencode, Graphify.

Is Codex safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.