# AI use cases for Codex (openai/codex) Repo: [openai/codex](https://github.com/openai/codex) | Use cases: 3 | Page: https://dedupedai.com/use-cases/openai-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`. This file holds every use case of this repo. Each one starts with a "## " heading and ends with its URL. - Install Codex CLI and run it on your repo with your ChatGPT plan: https://dedupedai.com/use-cases/openai-codex/install-codex-cli-and-sign-in-with-chatgpt/ - Install Codex CLI on Windows with one PowerShell line: https://dedupedai.com/use-cases/openai-codex/install-codex-on-windows-with-powershell/ - Use Codex inside VS Code, Cursor or the desktop app: https://dedupedai.com/use-cases/openai-codex/use-codex-in-vs-code-cursor-or-the-desktop-app/ ## How to install Codex CLI and run it on your repo with your ChatGPT plan with Codex Repo: [openai/codex](https://github.com/openai/codex) | Difficulty: Beginner | Time: 10 minutes | Basis: From the README Install the Codex CLI, sign in with the ChatGPT plan you already pay for, and start it inside a project. **Who it is for:** A developer with a ChatGPT subscription who wants a terminal coding agent without setting up API billing. **The problem:** Paying separately for API tokens to try a coding agent is a hurdle when you already have a ChatGPT plan. **The outcome:** Codex running in your project folder, signed in with ChatGPT, ready to take a task. ### Steps 1. On macOS or Linux run `curl -fsSL https://chatgpt.com/codex/install.sh | sh` 2. Or install with npm: `npm install -g @openai/codex`, or with Homebrew: `brew install --cask codex` 3. cd into your project and run `codex` 4. Choose Sign in with ChatGPT so usage counts against your Plus, Pro, Business, Edu or Enterprise plan 5. Give it a first task, such as explaining the repo layout or fixing one failing test, and review every change it proposes ### Prompt to paste into your agent ```text Install openai/codex with `npm install -g @openai/codex`, run `codex` in , sign in with ChatGPT, then ask it to . Show me the diff before anything is committed. ``` ### Caveat Using an API key instead of a ChatGPT plan needs the additional setup in the Codex auth docs. Risk, remote script: The quickstart pipes install.sh into your shell; use the npm or Homebrew install if you would rather not run a remote script. Disclaimer: Third-party repos we don't own or vouch for. AI-generated use cases can be wrong: review everything and run at your own risk. Full text: https://dedupedai.com/disclaimer/ URL: https://dedupedai.com/use-cases/openai-codex/install-codex-cli-and-sign-in-with-chatgpt/ ## How to install Codex CLI on Windows with one PowerShell line with Codex Repo: [openai/codex](https://github.com/openai/codex) | Difficulty: Beginner | Time: 10 minutes | Basis: From the README Use the official PowerShell installer to get Codex on a Windows machine and start it in a project. **Who it is for:** A Windows developer who wants the same terminal coding agent their Mac teammates use. **The problem:** Most agent quickstarts assume macOS or Linux, which leaves Windows users guessing. **The outcome:** Codex installed on Windows from the official installer and running in your repo. ### Steps 1. Open PowerShell and run `powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"` 2. If your network blocks releases.openai.com, set `$env:CODEX_INSTALLER_USE_RELEASES_OPENAI_COM='false'` first so the installer uses GitHub Releases 3. Open your project folder and run `codex` 4. Sign in with ChatGPT, or follow the API key setup in the docs ### Prompt to paste into your agent ```text Install openai/codex on this Windows machine with the official PowerShell installer from the README, confirm `codex` starts in , and tell me which sign-in option it offers. ``` ### Caveat Risk, remote script: The installer is fetched with irm and run with iex, which executes a remote script; read it first if that matters to you. Disclaimer: Third-party repos we don't own or vouch for. AI-generated use cases can be wrong: review everything and run at your own risk. Full text: https://dedupedai.com/disclaimer/ URL: https://dedupedai.com/use-cases/openai-codex/install-codex-on-windows-with-powershell/ ## How to use Codex inside VS Code, Cursor or the desktop app with Codex Repo: [openai/codex](https://github.com/openai/codex) | Difficulty: Beginner | Time: 15 minutes | Basis: From the README Move from the terminal to Codex in your editor or the desktop app, with the same account. **Who it is for:** A developer who likes Codex but would rather review edits inside the editor they already use. **The problem:** Switching between a terminal agent and an editor makes it harder to follow what changed. **The outcome:** Codex available in VS Code, Cursor or Windsurf, or as a desktop app, alongside the CLI. ### Steps 1. Install the CLI with `npm install -g @openai/codex` and sign in once with ChatGPT 2. For your editor, install the Codex IDE extension in VS Code, Cursor or Windsurf as the README links 3. For a desktop experience, run `codex app` 4. Keep using `codex` in the terminal for scripted or remote work ### Prompt to paste into your agent ```text Set up openai/codex for me in and as the desktop app with `codex app`, using my ChatGPT sign-in, then open and ask it to so I can compare the views. ``` ### Caveat Disclaimer: Third-party repos we don't own or vouch for. AI-generated use cases can be wrong: review everything and run at your own risk. Full text: https://dedupedai.com/disclaimer/ URL: https://dedupedai.com/use-cases/openai-codex/use-codex-in-vs-code-cursor-or-the-desktop-app/