Codex / Codex CLI Complete Guide¶
For / Key Points
This hub is for readers choosing where to start with Codex CLI, approvals, automation, and GPT-5-Codex. Follow the tabs by level to move from setup to safer automation without jumping into advanced patterns too early.
An AI agent deeply integrated with engineering workflows: command execution, review automation, and parallel tasking.
Pick a tab for your level and follow the steps.
What we learned from daily use
Codex CLI operations center on approvals, permissions, and logs/reproducibility. The Plan mode "think then execute" workflow is the most stable pattern.
Connect via ChatGPT for the fastest setup. 15 minutes to get running.
Step 1 — Install and basics
- Overview & Quickstart — ChatGPT-connected fastest setup
- Comprehensive Guide — Install, pricing, security
- Pricing Guide — Free vs paid comparison and switch thresholds
Step 2 — Learn best practices
- Best Practices — Design, change, verify — small and fast
- Hands-on Implementation — From project setup to production operations
📝 Beginner advice: Start with Quickstart → Best Practices. The Pricing Guide can wait until you consider paid plans.
Safely automate with approval policies, Plan mode, and CI integration.
Step 3 — Understand approvals and Plan mode
- No-Approval Guide — Complete guide to No Approval mode
- Approval Policy Implementation — approval_policy patterns
- Plan Mode Complete Guide — Plan → Execute to stop wandering
- /review Command Deep Dive — Integrate auto code review into CI/CD
Step 4 — Build automation pipelines
- How to use /goal — Enable steps, commands, and objective examples
- What is /goal? — Replace repeated "keep going" prompts with an autonomous loop
- Second-Pass Review — Review plans and diffs in an independent session
- 3 Automation Workflow Patterns — GitHub Actions, cron, CI integration
- GitHub Actions Integration — Run Codex CLI safely in CI
- Session Management — Session control and management
💡 Practitioner's tip: Go "Plan mode → Approval policy → CI integration" in order. Learning Plan mode first naturally reveals why approval design matters.
Achieve 7-hour autonomous operation with GPT-5-Codex architecture.
Step 5 — Master GPT-5-Codex
- GPT-5-Codex Beginner Guide — 3-minute quickstart
- GPT-5-Codex Deep Dive — 7-hour autonomous AI engineer
- Autonomous Patterns — Implementation patterns and failure avoidance
- 0.6x Complete Guide — 50% perf improvement, GPT-5-Codex-Mini
Version updates
- 0.51–0.53 Updates — 3 rapid releases reshaping operations
- 0.50.0 Release — Risk assessment and MCP stabilization
- 0.48–0.49 — Major update complete guide
💡 For advanced users: GPT-5-Codex autonomous runs are powerful, but approval policy and Plan mode design are prerequisites. Skipping intermediate steps leads to accidents.
Troubleshooting¶
| Article | Description |
|---|---|
| Network Restrictions Fix | Common network issue solutions |
| Diagnostic Logs Deep Dive | Troubleshooting practice guide |
| 5 Production Failure Patterns | Quick fixes for common failures |
| Context Window Error | Fix "ran out of room" instantly |
Comparison & Selection¶
| Article | Description |
|---|---|
| Codex CLI vs Claude Code | How to choose in practice |
| 2026 Benchmark Comparison | Accuracy vs speed — which to pick |
Related Topics¶
- Claude Code: Claude Code Article Guide — Comparison and selection
- GitHub Copilot: Copilot Article Guide — Assist vs agent