Learn Codex
Harness OpenAI's Codex CLI for sandboxed execution, project scaffolding, and automated development workflows.
NOTE
Last Verified
Content updated for Codex CLI v0.136+ (June 2026). Codex is actively developed — check github.com/openai/codex for the latest release notes.
Welcome to Learn Codex
OpenAI's Codex CLI is an open-source command-line tool that brings AI-assisted development to your terminal with a safety-first approach. Its sandboxed execution model means you can let AI run code and make changes with confidence — everything happens in a controlled environment.
This course takes you from first run to advanced automation across 10 progressive lessons.
What You'll Build
By the end of this course, you'll be able to:
- Run Codex CLI with confidence in its sandboxed execution model
- Perform file operations (create, edit, analyse) with AI assistance
- Execute multi-step tasks with approval workflows
- Debug and resolve errors using AI-driven analysis
- Scaffold entire projects from natural language descriptions
- Automate repetitive development tasks with custom configurations
Course Structure
| Section | Topic | Duration |
|---|---|---|
| Installation | Setting up Codex CLI | 15 min |
| Lesson 1 | Getting Started with Codex CLI | 30 min |
| Lesson 2 | Sandboxed Execution | 45 min |
| Lesson 3 | File Operations | 40 min |
| Lesson 4 | Multi-Step Tasks | 45 min |
| Lesson 5 | Debugging & Error Resolution | 45 min |
| Lesson 6 | Project Scaffolding | 50 min |
| Lesson 7 | Testing with Codex | 45 min |
| Lesson 8 | Configuration & Customization | 40 min |
| Lesson 9 | Integration Workflows | 50 min |
| Lesson 10 | Advanced Automation | 60 min |
Prerequisites
- A computer with macOS, Linux, or Windows
- Basic terminal familiarity
- A ChatGPT Plus/Pro/Business account, or an OpenAI API key