Here we are gonna talk about the complete setup guide step by step of ChatGPT at your terminal CLI using Codex for Windows, Linux and Mac.
Codex is OpenAI’s terminal tool that brings ChatGPT to the command line.
If you are not familiar with basic setups than please first go to BASIC GUIDE to understand the concept overall.
i will guide you well but in any case you have confusion, you can visit my Discussion Page.
Best for:
- High-level analysis
- Strategic thinking
- Quality review
- Different perspective from Claude/Gemini
Quick Navigation
Installation
Basic Usage
Launch
Context File
Creates agents.md in your project directory.
Workflow
In multi-tool setup:
# Terminal 1: Claude (writing)
claude
> Write a hook for this video, authority angle
# Terminal 2: Gemini (research)
gemini
> Write a hook on discovery angle
# Terminal 3: Codex (review)
codex
> Review both hooks and compare their strengthsRole in Multi-Tool Workflow
When to Use Codex
✅ Use Codex for:
- Reviewing Claude’s output
- High-level strategy
- Comparing approaches
- Ensuring clarity
- Catching issues Claude/Gemini miss
❌ Don’t use Codex for:
- Deep technical writing (Claude better)
- Current web research (Gemini better)
- Long-form content creation
Typical Workflow
# 1. Claude creates claude > Write a technical blog post about ZFS # 2. Gemini researches gemini > Verify technical accuracy and find recent benchmarks # 3. Codex reviews codex > Review the blog post at blog.md Check: clarity, flow, technical accuracy, audience fit
Context File Syncing
Important: Codex uses agents.md
Sync with other tools:
# In Claude terminal claude > Sync claude.md content to gemini.md and agents.md
Now all three tools share context!
Pricing
Requires: ChatGPT Plus ($20/mo) or API key
- ChatGPT Plus: Use existing subscription
- API key: Pay per token usage
Comparison
| Feature | Codex | Claude Code | Gemini CLI |
|---|---|---|---|
| Strength | Analysis | Deep work | Research |
| Context File | agents.md | claude.md | gemini.md |
| Cost | $20/mo | $20/mo | Free |
| Best For | Review | Creating | Research |
Tips from Technologia
1. Use for High-Level Analysis
“ChatGPT is very good at analyzing things from a high view.”
Good prompts:
> Review this architecture and identify weaknesses > Is this explanation clear for beginners? > Compare these two approaches strategically
2. Last Step in Pipeline
Claude writes → Gemini verifies → Codex reviews
3. Different Perspective
When Claude and Gemini agree, ask Codex for a third opinion:
> Claude and Gemini both recommend approach A. What do you think? Any risks we're missing?
Official Documentation
What’s Next?
Explore:
➡️ Gemini Complete Guide
➡️ Cloude Code Complete Guide
➡️ DeepSeek Complete Guide
➡️ OpenCode Complete Guide
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