Developers who want to hand off bugs and features to parallel agents can start on ChatGPT Free, with heavier use on paid plans.

Kenning's take

What it does

Codex is an AI agent from OpenAI that takes on programming tasks such as fixing bugs, refactoring and building features, and can run several agents in parallel. It works in the ChatGPT desktop app, a command-line tool, an editor extension and in the cloud, and can review pull requests automatically. It is included in ChatGPT plans, with an API-key option billed at API rates.

• Runs many coding agents in parallel
• Cloud tasks that keep going after the laptop is closed
• Automatic pull request review
• Codex CLI, IDE extension, web and desktop app
• Plugins to connect other tools

Who it suits. Software developers and engineering teams who want to hand coding tasks to an AI agent.

Key facts

Category

Developer tools

Part of

ChatGPT

Made by

OpenAI

Released

16 May 2025

How to get it

Included in ChatGPT Free, Go, Plus, Pro, Business, Edu and Enterprise plans with different usage limits; also usable with an API key at API prices (no cloud features)

Works on

Mac, Windows, Linux, Web, iOS, CLI, IDE extension

In the UK

Yes

Free plan

Yes, ChatGPT Free includes limited Codex use with GPT-6 Luna, subject to rollout

API price

With an API key, Codex usage is billed at the API price of the chosen model

Pricing

Plan	Price	Billed
Free	$0	month
Go	$8	month
Plus	$20	month
Pro	$100	month (also $200 and $500 tiers)
Business	$20	user per month, billed annually, 2+ users ($25 billed monthly)
Enterprise and Edu	$contact sales	None

source

FAQ

Facts from the maker's own pages and the sources listed. Checked 2026-10-11.