ChatGPT/Codex

ChatGPT/Codex is the learning topic for using OpenAI’s chat AI and coding agent in practical development work.

This topic treats Codex not as a simple code generator, but as a development agent connected to local workspaces, cloud environments, IDEs, GitHub, and verification commands.

ChatGPT/Codex Product Surfaces

• ChatGPT Chat — the conversational AI assistant available through ChatGPT
• Sites — the ChatGPT workflow for creating, hosting, refining, and sharing websites, web apps, and games
• Codex App — the desktop app for managing Codex threads, worktrees, automations, and local or cloud coding work
• Codex CLI — the terminal-first local coding agent
• Codex IDE Extension — the editor-attached Codex surface for working near the code being edited
• Codex Web — the GitHub-connected cloud surface for delegated implementation, review, and pull requests

What I Cover Here

ChatGPT Features & Product Lineup

Understand ChatGPT plans, the product lineup, and the core features that support everyday work and Codex usage.

Codex Features & Product Lineup

Understand the main Codex entry points and how Codex connects to ChatGPT plans and development environments.

Codex Level Up

Practice expanding the scope of work you give Codex while keeping verification and review clear.

Codex Harness

Design the working environment Codex needs: AGENTS.md, shared rules, verification commands, permissions, and GitHub integration.

Codex Mobile

Learn how to connect the ChatGPT mobile app to a Codex App host and give instructions, approve actions, review diffs, and inspect test results away from your desk.