Codex CLI

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I found Codex to be best among Open Code Terminal, Gemini CLI and Qwen CLI tried so far.

Install Codex CLI

  1. Install using:
    npm install -g @openai/codex
  2. Authenticate: Export your OpenAI API key
    export OPENAI_API_KEY="<OAI_KEY>"
    Add in ~/.bashrc
  3. For current session use
    . ~/.bashrc
  4. Run in full automatic mode via
    codex --full-auto
  5. We can set required model with higher limits or desired pricing while running using:
    codex --full-auto --model gpt-5-mini


Internal commands in Codex

/approvals
Enable full changes
/model
Select GPT-5 medium
/init
Study current folder to create AGENTS.md file with description of project for future use
/new
Create a new chat session. Forget previous chat


Costing

Look at limits for your tier via https://platform.openai.com/settings/organization/limits and also pricing per model at https://openai.com/api/pricing/


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