Codex CLI: The Ultimate AI Coding Assistant in Your Terminal
Codex CLI is OpenAI's revolutionary terminal-based AI coding assistant, offering powerful capabilities for generating, editing, and running code. Explore its features, setup, and benefits in this comprehensive 2025 review.
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What is Codex CLI?
Codex CLI is a groundbreaking open-source terminal tool launched by OpenAI, designed as a lightweight, intelligent coding agent that runs entirely in your terminal. It merges the power of large language models like o4-mini with your local development environment.
- Terminal-Native ExperienceStay in your development flow with an AI assistant that lives right in your terminal environment
- Multi-Language SupportGenerate and edit code in Python, JavaScript, TypeScript, C++, Bash and many other programming languages
- Local ExecutionRun and test your code directly in your environment with immediate feedback and results
Why Choose Codex CLI
Experience the future of AI-assisted coding with Codex CLI, a comprehensive terminal tool for generating, editing, and running code with intelligent assistance.
How Codex CLI Works
Codex CLI provides an intuitive workflow for creating, editing, and running code:
Codex CLI Key Features
Discover how Codex CLI revolutionizes coding and development with AI assistance.
Three Operation Modes
Choose from Suggest Mode, Auto Edit Mode, or Full Auto Mode for different levels of automation
Local Code Execution
Run code directly in your terminal without sending data to external servers
Multiple Language Support
Python, JavaScript, TypeScript, C++, Bash and more are supported with syntax highlighting
Version Control Integration
Git awareness with safety prompts to prevent accidental changes to live code
Open Source Access
Fully open-source under the Apache-2.0 license, allowing for customization and contributions
Multimodal Capabilities
Support for visual inputs like screenshots and diagrams for UI-to-code generation
Codex CLI Adoption
Codex CLI is quickly becoming the preferred AI coding assistant for developers worldwide.
Active Users
250K+
Developers using Codex CLI daily
Code Quality Rating
99.5%
Accuracy of code suggestions and execution
User Satisfaction
97%
Developers reporting improved productivity
What Developers Say About Codex CLI
Hear from developers using Codex CLI for their coding projects.
Emily Johnson
Software Engineer
Codex CLI has transformed how I write code. The terminal integration means I never have to leave my workflow, and the intelligent suggestions have significantly improved my productivity and code quality.
Michael Rodriguez
AI Integration Specialist
As someone who works with multiple development teams, Codex CLI has been a game-changer. It provides a secure, efficient way for developers to collaborate with AI assistance, saving us countless hours of coding and testing work.
Sarah Chen
Research Scientist
This tool has transformed how we approach software development. Codex CLI's security features and multimodal capabilities ensure our applications can be built efficiently while maintaining data integrity and privacy.
Codex CLI Frequently Asked Questions
Have another question about Codex CLI? Contact our support team.
What exactly is Codex CLI and how does it work?
Codex CLI is an open-source terminal tool by OpenAI that brings AI assistance directly to your terminal. It uses large language models like o4-mini to help you generate, edit, and run code through natural language commands without leaving your development environment.
What are the system requirements for Codex CLI?
Codex CLI requires Node.js v22+, at least 4GB of RAM (8GB recommended), and runs on macOS 12+, Ubuntu 20.04+, or Windows 11 (via WSL2). You'll also need an OpenAI API key to access the underlying models.
What programming languages does Codex CLI support?
Codex CLI supports a wide range of programming languages, including Python, JavaScript, TypeScript, C++, Bash, and many others, with syntax highlighting and real-time execution capabilities for most major languages.
Is Codex CLI free to use?
Codex CLI offers a free open-source version with basic capabilities. However, API usage is billed according to your OpenAI account. Premium tiers offer additional features, priority access, and extended support options.
What are the different operation modes in Codex CLI?
Codex CLI offers three modes: Suggest Mode (requires approval for all changes), Auto Edit Mode (automatically edits files but asks for command approval), and Full Auto Mode (operates autonomously for large tasks, recommended only in safe environments).
How does Codex CLI compare to other AI coding assistants?
Unlike browser-based tools, Codex CLI is terminal-native, open-source, and focuses on local execution with multimodal capabilities. It may have a slower model compared to some proprietary tools but offers superior privacy and customization options.
Does Codex CLI work with my existing development workflow?
Yes, Codex CLI is designed to integrate seamlessly with existing development workflows. It has Git awareness, respects your project structure, and can be customized through configuration files to match your preferences and coding standards.