OpenAI's Codex CLI is a terminal-based AI coding agent that uses o4-mini to read, write, and execute code in your projects. Getting it installed correctly — especially in corporate environments with proxies, or in CI/CD pipelines — can be tricky.
This guide covers installation on every platform, common issues, and production deployment patterns.
Codex CLI is OpenAI's answer to Claude Code. It's a terminal agent that:
Key difference from Claude Code: Codex CLI is open source and uses o4-mini (cheaper, faster) rather than Opus 4 (more capable, expensive). It's better for routine tasks; Claude Code is better for complex architecture work.
| Requirement | Minimum | Recommended |
|---|---|---|
| Node.js | 18.0+ | 22.x LTS |
| npm | 9.0+ | 10.x |
| OS | macOS 12+, Ubuntu 20.04+, Windows 10+ (WSL2) | Latest |
| RAM | 4GB | 8GB+ |
| Disk | 500MB | 1GB |
For corporate environments behind a proxy:
Create a setup script for your team:
| Usage Pattern | OpenAI Direct | Crazyrouter | Monthly Savings |
|---|---|---|---|
| Light (20 sessions/day) | $45/month | $18/month | $27 (60%) |
| Medium (50 sessions/day) | $112/month | $45/month | $67 (60%) |
| Heavy (100 sessions/day) | $225/month | $90/month | $135 (60%) |
| CI/CD (500 runs/month) | $150/month | $60/month | $90 (60%) |
o4-mini pricing:
Run npm install -g @openai/codex-cli with Node.js 18+. Set your API key with export OPENAI_API_KEY="your-key". Then run codex in any project directory.
The CLI tool itself is free and open source. You pay for API usage (o4-mini tokens). OpenAI charges 1.10/1.10/4.40 per million tokens. Through Crazyrouter, it's 0.44/0.44/1.76 — about 60% cheaper.
Yes. You can point Codex CLI to any OpenAI-compatible API endpoint. Set OPENAI_BASE_URL to Crazyrouter or another provider that offers o4-mini access.
Not natively. Use WSL2 (Windows Subsystem for Linux) which provides a full Linux environment. Codex CLI works perfectly inside WSL2.
Codex CLI is a terminal agent that can read/write files and run commands autonomously. Copilot is an editor plugin that suggests code inline. Codex CLI handles larger tasks (refactoring, debugging, feature implementation); Copilot helps with line-by-line completion.
Codex CLI installation is straightforward on macOS and Linux (npm install -g @openai/codex-cli). For Windows, use WSL2. For corporate environments, configure proxy settings and custom certificates. For CI/CD, add it as a build step with your API key as a secret.
Use Crazyrouter as your API backend to cut Codex CLI costs by 60% while maintaining the same o4-mini model quality. One environment variable change (OPENAI_BASE_URL) is all it takes.
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