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OpenAI Codex

OpenAI Codex

Inspect, edit, and run code from the terminal, then hand longer tasks to the cloud

Terminal Coding ToolCoding AgentTerminalCloud TasksTrial

OpenAI Codex is a coding agent that works in the terminal, IDE, cloud, and ChatGPT apps. It inspects repositories, makes edits, runs commands, reviews changes, and opens pull requests, with local CLI, editor integration, and long-running cloud tasks under one account.

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Updated

2026-10-21

Platforms

Windows / macOS / Linux / Web / iOS

Freemium

Freemium: the official pricing docs list a $0 Free plan for quick coding tasks, Go at $8 per month, Plus at $20 per month with Codex on web, CLI, IDE, and iOS, and Pro plans from $100 per month. An API key works in the CLI, SDK, and IDE extension without cloud features and is billed at API token prices; confirm current limits and regional availability on the official pricing page.

* Pricing is for reference only; see the official site for current pricing.

OpenAI Codex
openai.com

OpenAI Codex Key Features

  • Terminal Loop

    Explore a repository, plan a change, edit files, and run local tools while inspecting commands and diffs as they appear.

  • Cloud Handoff

    Each cloud task gets its own workspace, so longer work can continue while you review results and open a pull request later.

  • IDE and MCP

    Bring open files and selections into the prompt, review edits in place, and connect local or remote MCP servers from the CLI.

  • Scriptable Runs

    Run Codex non-interactively in repeatable workflows, pipelines, and automated checks.

OpenAI Codex Best For

Terminal-first developers

Keep exploration, edits, command runs, and reviews in one CLI loop, with codex exec for scripts and CI.

Engineering teams working on GitHub

Start cloud tasks from repositories, then review diffs and open pull requests from web, mobile, or desktop.

Developers in VS Code, Cursor, or JetBrains

Use open files and selections as context and review focused diffs beside the code.

Pros

  • Works across CLI, IDE extension, cloud, and ChatGPT apps with the same ChatGPT account
  • Cloud tasks run in separate workspaces and can continue while your computer sleeps
  • codex exec makes the agent usable in scripts and CI pipelines
  • A free tier plus low-cost Go and Plus plans make it easy to start

Considerations

  • Cloud features such as GitHub code review and Slack require a paid ChatGPT plan
  • API-key authentication works in the CLI, SDK, and IDE extension but excludes cloud features
  • Plan availability and some features vary by region

OpenAI Codex Quick Start and Practical Tips

Quick start

  1. 1

    Start in the terminal on a real repository and ask it to explain one file's role first, so you see how it reads context before letting it edit anything.

  2. 2

    Hand a small, well-scoped change to the CLI and review the diff, then send the same kind of task to a cloud task to compare quality and turnaround.

  3. 3

    Once the pattern is stable, wire codex exec into a script or CI step so repetitive chores run without you in the loop.

Pro tip

The useful split is local for exploration, cloud for duration. Keep exploratory work and anything touching uncommitted changes in the terminal; move long, self-contained tasks to the cloud so they keep running while your machine sleeps. Never point automated codex exec jobs at an unprotected branch: give it a dedicated branch and require review, because the failure mode is a silent wrong commit rather than an error.

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