Codex CLI
OpenAI's Terminal Coding Agent
Open-source AI coding tool built with Rust, supporting GPT-5.4, o3, o4-mini models with local execution and MCP integration
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Installation Guide
Step 1: Install
Install globally via npm: npm i -g @openai/codex
npm install -g @openai/codex
Step 2: Authenticate
Log in with ChatGPT account or API key
export OPENAI_API_KEY=sk-...
Step 3: Launch
Run the codex command in your project directory
codex "explain this project"
Step 4: Select Model
Use /model command to switch between GPT-5.4, o3, or o4-mini
Key Features
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| seo_codex_cli.table_dimension | Codex CLI | Claude Code |
|---|---|---|
| seo_codex_cli.dim_architecture | seo_codex_cli.codex_architecture | seo_codex_cli.claude_architecture |
| seo_codex_cli.dim_model | seo_codex_cli.codex_model | seo_codex_cli.claude_model |
| seo_codex_cli.dim_context | seo_codex_cli.codex_context | seo_codex_cli.claude_context |
| seo_codex_cli.dim_pricing | seo_codex_cli.codex_pricing | seo_codex_cli.claude_pricing |
| seo_codex_cli.dim_execution | seo_codex_cli.codex_execution | seo_codex_cli.claude_execution |
| seo_codex_cli.dim_agent | seo_codex_cli.codex_agent | seo_codex_cli.claude_agent |
| seo_codex_cli.dim_voice | seo_codex_cli.codex_voice | seo_codex_cli.claude_voice |
| seo_codex_cli.dim_opensource | seo_codex_cli.codex_opensource | seo_codex_cli.claude_opensource |
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Use AI Coding Tools via QCode.cc
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Codex Ecosystem Expansion
From CLI tool to super app — the OpenAI Codex ecosystem received a comprehensive upgrade in 2026.
Codex Desktop App
Native desktop app for macOS and Windows, supporting parallel management of multiple Agent instances without terminal.
- macOS + Windows dual platform
- Parallel management of multiple Agent instances
- Visual task queue and execution status
ChatGPT Super App Merge
On April 6, 2026, ChatGPT, Codex CLI, and Atlas browser merged into the ChatGPT Super App.
- Unified: Chat + Code + Browse
- Cross-modal task orchestration
- Plugin ecosystem fully open
Latest Model Lineup
GPT-5.3-Codex-Spark
Coding-specialized, highest SWE-bench score
GPT-5.4
Flagship model with Codex coding capabilities
GPT-5.5
Dedicated model for Super App multimodal tasks