Screenshots
Codex
A coding agent in your ChatGPT plan
Enki editor score
Excellent
Human-vetted editorial rating
We may earn a commission if you sign up through our links. It never affects our ratings or which stories we cover.
Overview
Codex is OpenAI's coding agent and comes with ChatGPT plans rather than as a separate product. It runs as an open-source CLI, an IDE extension for VS Code, Cursor and others, inside the ChatGPT desktop app, and as Codex Cloud, where each task gets its own workspace that keeps working while your computer sleeps and can open pull requests. Paid plans add automatic GitHub code review and a Slack integration.
Enki verdict
The best value way into agentic coding if you already pay for ChatGPT, with strong cloud tasks and review; limits are harder to predict than rivals'.
Key features
Codex Cloud
Each task runs in its own cloud workspace and can open a PR.
Open-source CLI
A terminal agent you can inspect and extend.
Code review
Automatic review on GitHub pull requests.
Pros & cons
What we like
- Included with ChatGPT, with limited access even on Free
- Open-source CLI under Apache 2.0
- Cloud tasks with their own workspaces, PRs and automatic code review
Worth noting
- Usage limits come as wide ranges, not fixed numbers
- Free and Go get only the smallest model
- An API key loses all cloud features
Codex pricing
Is Codex free?
Partly. ChatGPT Free and Go include limited Codex in the desktop app, using GPT-6 Luna, subject to rollout.
- GPT-6 Luna only, at standard speed
- In the ChatGPT desktop app, subject to rollout
- No cloud tasks, code review or Slack on Free
ChatGPT Plus
$20/mo
- Codex on web, CLI, IDE extension and iOS
- GPT-6 Sol and GPT-6 Luna
- GitHub code review and Slack
- Buy credits for extra usage
ChatGPT Pro
$100, $200 or $500/mo
- Everything in Plus with much more usage
- No five-hour limit on Pro plans
ChatGPT Business
$20/user/mo
2+ users, billed annually; $25 monthly
- No training on business data by default
Price history
- Checked against OpenAI's Codex pricing docs: included with ChatGPT Free and Go (limited), Plus $20, Pro $100 to $500, Business $20 per user billed annually.
Source: Codex's official pricing, checked Oct 1, 2026. Prices can change; confirm at checkout.
Codex FAQ
- Is Codex free?
- Partly. ChatGPT Free and Go include limited Codex in the desktop app with the GPT-6 Luna model, subject to rollout. The CLI, cloud tasks, code review and stronger models need Plus or above.
- How much does Codex cost?
- Codex comes with ChatGPT plans: Plus is $20 a month, Pro is $100, $200 or $500, and Business is $20 per user a month billed annually. Using an API key instead is billed at API rates and drops the cloud features.
- Is the Codex CLI open source?
- Yes. The Codex CLI is open source under the Apache 2.0 license.
- What are Codex usage limits?
- OpenAI gives ranges rather than fixed caps, per five hours and per week, depending on the model. On Plus, the heaviest model allows roughly 5 to 45 local messages per five hours. Pro plans have no five-hour limit.
Reviews
Sign in to reviewNo written reviews yet — be the first to share your experience.
