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OpenAI Codex

Made Crystal Clear

A practical, visual guide to delegating real coding work to OpenAI's software engineering agent

Codex is one agent met in four places: your terminal, your editor, OpenAI's cloud, and your pull requests. This guide runs from a first supervised session to a morning batch of delegated tasks: the AGENTS.md briefing that changes agent behavior, model and reasoning choices that steer your usage limits, code review on every PR, and the sandbox that makes a fooled model harmless. A re-runnable framework scores it against Claude Code and Cursor. One habit is trained throughout: judge the diff, never the summary.

Pages
172
Level
Beginner to advanced
Status
Available
Kindle · $12.99 ↗Paperback · $33.99 ↗Give feedback

Inside the book

  1. 01From Autocomplete to Delegation
  2. 02One Agent, Four Surfaces
  3. 03First Session
  4. 04AGENTS.md, the Standing Briefing
  5. 05Pairing: The Interactive Loop
  6. 06Models, Reasoning Effort, and Your Usage Budget
  7. 07Delegating to Codex Cloud
  8. 08Code Review on Every Pull Request
  9. 09Running an Agent Team
  10. 10Power Configuration: config.toml, MCP, and the SDK
  11. 11Codex, Claude Code, or Cursor?
  12. 12The Business Case
  13. 13Running Codex Safely in Production
  14. 14Your 90-Day Path and Cheat Sheet
  15. 15Resources: Where to Go Deeper

You'll leave with

  • See how one agent spans CLI, IDE, cloud, and code review
  • Write an AGENTS.md briefing that actually changes agent behavior
  • Pair with per-hunk diffs, plan-first prompts, and a definition of done

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Sources

Every source cited in OpenAI Codex Made Crystal Clear. Each number matches the [n] marker next to that link in the book's "Go deeper" lists, so you can trace any claim back to its origin.

  1. [1]Codex documentation hub
  2. [2]openai/codex on GitHub
  3. [3]Codex quickstart
  4. [4]Codex pricing and plans
  5. [5]Wikipedia: Codex (AI agent)
  6. [6]Simon Willison on GPT-5-Codex
  7. [7]Builder.io: Codex vs Claude Code
  8. [8]Codex CLI guide
  9. [9]IDE extension guide
  10. [10]Codex cloud guide
  11. [11]GitHub code review docs
  12. [12]Authentication docs
  13. [13]Sandboxing and approvals
  14. [14]Codex changelog
  15. [15]Installing Codex CLI on Windows, 2026 guide
  16. [16]developers.openai.com/codex/agent-configuration/agents-md
  17. [17]developers.openai.com/codex/config-file/config-reference
  18. [18]developers.openai.com/codex/prompting
  19. [19]agents.md
  20. [20]builder.io/blog/agents-md
  21. [21]addyosmani.com/blog/code-agent-orchestra
  22. [22]Developer commands reference
  23. [23]VS Code Marketplace listing (openai.chatgpt)
  24. [24]developers.openai.com/codex/models
  25. [25]openai.com/index/gpt-6-astra
  26. [26]help.openai.com article 11369540
  27. [27]simonwillison.net/2025/Dec/19/introducing-gpt-52-codex
  28. [28]developers.openai.com/codex/environments/cloud-environment
  29. [29]developers.openai.com/codex/cloud/internet-access
  30. [30]chatgpt.com/codex/settings/environments
  31. [31]github.com/openai/codex-universal
  32. [32]zackproser.com/blog/openai-codex-review-2026
  33. [33]chatgpt.com/codex/settings/code-review
  34. [34]openai.com/index/codex-security-now-in-research-preview/
  35. [35]Codex SDK
  36. [36]Enterprise admin setup
  37. [37]Gartner 2026: Leader in enterprise coding agents
  38. [38]OpenAI trust portal
  39. [39]Codex CLI on Windows: native sandbox vs WSL

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