Codex CLI
Overview
Open-source terminal-based AI coding assistant that reads, writes, and executes code locally with multimodal input support.
Best For Professions:
Codex CLI is an open-source, terminal-native AI coding assistant developed by OpenAI. Designed for developers who prefer working directly in the terminal, it integrates OpenAI's latest models (like o4-mini) to perform tasks such as reading, modifying, and executing code within a local environment. Codex CLI supports multimodal inputs, allowing users to pass text, screenshots, or diagrams to generate or edit code accordingly. It offers three distinct approval modes—Suggest, Auto Edit, and Full Auto—providing flexibility in how autonomous the agent operates. The tool emphasizes security by running in a sandboxed, network-disabled environment and ensures that your source code remains on your machine unless explicitly shared. With zero-setup installation and compatibility with macOS, Linux, and experimental support for Windows via WSL, Codex CLI aims to streamline the development workflow by bringing powerful AI capabilities directly to the command line.
Product overview
Capabilities, pricing and fit
Codex CLI is best understood as an AI software-development agent. Lightweight coding agent that runs in your terminal.
Information as of July 30, 2026
What it can do
- Software engineering automation
Lightweight coding agent that runs in your terminal.[1]
Where it fits best
- Developers seeking a terminal-based AI assistant for coding tasks.[1]
Pricing and availability
Access: Source repository[1]
Sources (1)
- GitHub - openai/codex: Lightweight coding agent that runs in your terminal · GitHubGitHub · checked 2026-07-30
Autonomy level
67/100
Our subjective rating of how independently the product carries out its documented tasks, considering the human setup, input, approval and review it needs. This is not a measured success rate.
Comparisons
Custom Comparisons
Some of the use cases of Codex CLI:
- Developers seeking a terminal-based AI assistant for coding tasks.
- Automating code refactoring and debugging within a local environment.
- Executing shell commands and managing files securely through AI.
- Enhancing development workflows with multimodal input support.
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Popularity level: 85%
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