𝐘𝐀𝐈

Codex Manual

Codex Hub

Start from installation, choose the right Codex surface, and learn CLI, App, IDE extension, Web/Cloud, plugins, skills, YAI Router, and the GPT Image 2 API step by step.

OpenAI

This is a beginner-friendly Codex manual. Start with installation and your first local project, then move into configuration, permissions, YAI Router integration, and advanced capabilities.

Recommended path:

  1. Understand what Codex is.
  2. Install it for your operating system.
  3. Choose CLI, App, IDE Extension, or Web/Cloud.
  4. Complete one small task in a real project.
  5. Configure YAI Router and, when needed, generate or edit images through the Images API.
  6. Finish with safety settings and advanced workflows.

Sources checked on 2026-07-29: OpenAI Codex manual, OpenAI's image generation guide, the local /tmp/codex repository, and existing YAI Router articles.

1 What Is Codex A plain-language introduction to Codex, its use cases, and its boundaries. 2 Download and Install Install Codex on macOS, Windows, WSL2, and Linux. 3 Choose a Surface CLI, App, IDE Extension, and Web/Cloud use cases. 4 Your First Task Open a real project and run a small, verifiable Codex task. 5 Config and Login Understand config.toml, CODEX_HOME, environment variables, and platform-specific paths. 6 Use YAI Router Use YAI Router to manage Codex models, keys, quotas, and routing. 7 GPT Image 2 Images API Generate and edit images with gpt-image-2 through YAI Router's OpenAI-compatible Images API. 8 Permissions and Safety Understand sandboxing, approvals, and safe defaults. 9 Common Workflows Prompts for understanding projects, fixing bugs, adding tests, reviewing code, and updating docs. 10 Advanced Capabilities Goals, Skills, Plugins, Subagents, MCP, and further reading.