C
Codex
Description
An AI coding agent from OpenAI. It writes and edits code, works through your project, reviews changes and can work on a task in the cloud. It is available in the ChatGPT desktop app, in the terminal (Codex CLI), as a code editor extension and in the cloud (Codex Cloud), and it connects to GitHub and Slack. Codex is part of ChatGPT. The Codex CLI is open source.
Pros and cons
Pros
- Included in the free ChatGPT plan
- The Codex CLI source code is open
- Works in the terminal, in code editors, in the ChatGPT app and in the cloud
Key facts
- Free access
- Yes On the free ChatGPT plan, Codex is listed in the desktop app
- Pricing
- Pricing on the official site →
- Developer
- OpenAI
- Checked on
- Oct 12, 2026
Editorial score
How strongly the AI Expertise editors recommend this tool for each of its categories right now, on a 0–10 scale. The score combines output quality, features, beginner friendliness and freshness.