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Codex

by OpenAI@openaiSan Francisco, California, USANo ratings yet

OpenAI's coding agent for terminal, desktop, IDE and cloud repository work

Visit chatgpt.com
Tool type
AI coding agent
Made for
Developers and engineering teams
Runs on
Desktop, terminal, IDE and cloud
Installer for macOS/Linux shown; iOS listed with Plus.
Last checked
28 Oct 2026
3 product sources

What it does

Codex takes a plain-language task plus access to a code repository and returns inspected code, file edits, command runs and prioritized review findings. You describe what you want, such as explaining a project, refactoring a component or fixing a failure, and Codex works against your files and the tools installed on your machine. It can also hand work to cloud environments and return results to your local repository.

People use it from the terminal CLI, the desktop app, an IDE extension, the web, or non-interactively through codex exec in scripts and CI. A /review step checks uncommitted changes, a commit or a branch without modifying your working tree. Skills, plugins, MCP servers and subagents extend it, while /permissions and model settings control what it may do. Usage is shared with ChatGPT Work.

It suits developers and engineering teams who want an agent working inside real repositories. Access needs a ChatGPT sign-in (Free, Go, Plus, Pro, Business, Enterprise/Edu) or an API key. Cloud features such as GitHub code review and Slack are not available with an API key. Usage is limited by plan and varies with task size, model and mode, so heavy use can require purchased credits. Creating Git checkpoints before tasks is recommended.

What it can do

  • Inspect, edit and run code in a local repository from the terminal
  • Run non-interactive tasks with codex exec in scripts and CI
  • Review uncommitted changes, a commit or a base branch with /review
  • Delegate work to Codex cloud and apply results locally
  • Extend with skills, plugins, MCP servers and subagents
  • Set permissions, sandbox boundaries, model and reasoning effort per run

Works with

  • GitHub
  • Slack
  • Linear
  • MCP servers
  • Gmail
  • Google Calendar
  • Google Drive

Example workflows

Refactor and review locally
Input: a repository and a task such as refactoring a component. Steps: run codex in the project directory, describe the change, inspect commands and diffs, then run /review on uncommitted changes. Output: edited files plus prioritized review findings.
Automate a task in CI
Input: a repeatable prompt and an API key or access token. Steps: call codex exec from a pipeline script with chosen permissions. Output: non-interactive results from the workflow run.

Before you choose

  • Usage limits depend on model, task size and local versus cloud; Plus and Business have five-hour estimates and weekly limits may apply
  • API-key use is billed at API rates and excludes cloud features like GitHub review and Slack
  • Some models are being retired or are off by default for Enterprise/Edu until an administrator enables them

Listed under

Get started

Run codex in a project directory; an API key is also supported.

  1. Install the Codex CLI (macOS/Linux: curl -fsSL https://chatgpt.com/codex/install.sh | sh)
  2. Open a project directory, run codex and choose Sign in with ChatGPT or another available method
  3. Describe a first task, optionally run /init to create an AGENTS.md, and set /permissions
Install the CLI and sign in with ChatGPT

Plans and prices

Prices in USD

ChatGPT plans include differing Codex allowances; Plus is $20/month. Business is $20/user/month billed annually (2+ users), or $25 monthly. Extra credits extend usage. API-key use is separately billed at API rates.

Plus$20/moIndividual plan
  • Codex on web, CLI, IDE extension and iOS
  • Extend usage with ChatGPT credits
Business$20/user/moBilled annually, 2+ users; $25 if billed monthly
  • Larger cloud virtual machines
  • SAML SSO and MFA
API KeyUsage-basedBilled at standard API rates; see API pricing page
  • CLI, SDK or IDE extension
  • No cloud-based features

Source: learn.chatgpt.com/docs/pricing, checked 28 Oct 2026. Prices can change; check before you buy.

Sources for this overview

Product pages, documentation, and pricing checked 28 Oct 2026. Each source supports part of the overview; availability and prices can change.

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What’s changed

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Signals

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Where this comes from

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Last checked 28 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.