OpenAI Codex

OpenAI's coding agent, in the terminal, the IDE, the cloud and on pull requests.

Starting price: Included with ChatGPT Plus $20 / month
Free trial: Free ChatGPT tier with basic Codex
Commercial use: Yes

Overview

Codex is OpenAI's agentic coding tool, powered by a version of its GPT models tuned for software engineering. It shows up in four places that share one usage allowance: a CLI in the terminal, an IDE extension, a cloud sandbox that runs tasks remotely, and automated review on pull requests. You describe a task and Codex writes, runs and tests code on its own, delegating longer jobs to the cloud while you keep working. Access comes bundled with a ChatGPT plan or through the OpenAI API at token rates.

Our take

Codex fits developers already inside the OpenAI and ChatGPT ecosystem who want the same agent across the terminal, editor, cloud and pull requests under one allowance. It is bundled into ChatGPT rather than sold separately: the $20 Plus plan unlocks meaningful use including cloud task delegation, Pro raises limits from $100 to $200 per month, and Business covers teams; a free tier and an $8 Go tier exist but are limited. Because usage moved to token-based credits, heavy runs can require buying extra credits.

Key Facts

Category	AI Code
Starting price	Included with ChatGPT Plus $20 / month Codex is bundled into ChatGPT, not sold separately. A free tier and Go ($8 per month) are limited; Plus is $20, Pro from $100 (up to $200 for higher limits), Business $25 per user monthly or $20 billed annually. Also available through the OpenAI API at token rates.
Free trial	Free ChatGPT tier with basic Codex
Commercial use	Yes
Output	Autonomous coding across CLI, IDE, cloud and pull requests
API	Yes, through the OpenAI API

Screenshots

Placeholders. They are replaced as soon as the vendor sends material, and both open the same short form.

Features

Where it runs: Codex CLI in the terminal, an IDE extension, a desktop app, a cloud sandbox and automated pull request review, plus web and iOS
Inline completions: No, Codex is an agent rather than an inline autocomplete
Agent mode: Yes, it writes, runs and tests code and can delegate longer tasks to a cloud sandbox
Model choice: No, OpenAI's own GPT models tuned for coding
Data control: Three sandbox modes, read-only, workspace-write and danger-full-access, with writable roots to widen the boundary without switching the sandbox off; network access asks for approval by default. Approval policies are on-request, never or a granular set that keeps chosen prompt categories interactive and rejects the rest; the older untrusted policy is retired. In ChatGPT Work an administrator sets network access or an allowlist of hostnames, manages configuration and model availability, assigns workspace roles and reads audit events through a compliance API
Ecosystem fit: OpenAI and ChatGPT; one usage allowance shared across surfaces
API: Yes, through the OpenAI API

Integrations

GitHub
Visual Studio Code
Cursor
Windsurf
Xcode
JetBrains IDEs

Deployment and Support

Deployment: Cloud (SaaS)
Browser-based
Onboarding: Documentation and knowledge base
Company size: Freelancers
Small and mid-sized
Enterprise

Suitability

Industry	Freelancers	Small and mid-sized	Enterprise
Agencies	Not stated	Not stated	Not stated
Architecture & Engineering	Not stated	Not stated	Not stated
Consulting	Not stated	Not stated	Not stated
Media & Creative	Not stated	Not stated	Not stated
Technology	Stated as a fit	Stated as a fit	Stated as a fit

The table combines the industries the vendor addresses with the company sizes the tool is aimed at. An empty cell means the combination is not stated, not that it is ruled out.

Pros and Cons

Strengths

One agent and one allowance across the terminal, IDE, cloud and pull requests
Bundled into existing ChatGPT plans, easy to reach if you already pay for ChatGPT
Cloud sandbox runs longer tasks asynchronously while you keep working

Limitations

Tied to OpenAI's own models, with no third-party model choice
Token-based credits mean heavy use can need extra purchases; the free and Go tiers are limited

Pricing

Free

$0

Basic Codex capabilities.
Go

$8

Per month. Light use; excludes cloud task delegation.
Plus

$20

Per month. Includes Codex with cloud task delegation.
Pro

From $100

Per month for 5x limits, $200 per month for 20x limits.
Business

$25

Per user monthly, or $20 billed annually.
Enterprise

Custom

Contact sales.

Best For

Technology

Alternatives and Comparisons

What users say

Reviews

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