Codex CLI
| Codex CLI | |
|---|---|
 | |
| Developers | OpenAI Open-source contributors |
| Release | April 16, 2025 |
| Written in | Rust |
| Operating system | macOS, Linux, Windows |
| Type | AI coding agent |
| License | Apache License 2.0 |
| Website | developers |
| Repository | https://github.com/openai/codex |
Codex CLI is an open-source artificial intelligence coding agent developed by OpenAI. It operates through a command-line interface and can read and modify files, execute commands, and perform software development tasks on a user's local computer.[1][2]
Codex CLI is part of OpenAI's broader Codex software-development platform, alongside Codex extensions for integrated development environments, desktop applications, and cloud-based development.[3]
History
[edit]OpenAI released Codex CLI on April 16, 2025, alongside the introduction of its o3 and o4-mini reasoning models. The software was introduced as a lightweight coding agent designed to connect OpenAI models with source code and computing tasks through a user's terminal.[4]
Features
[edit]Codex CLI works directly with the files and directories of a software project, allowing it to create and modify source code without requiring an integrated development environment. Through its command-line interface, it can also execute shell commands, use web search, and run build tools, application frameworks, web frameworks, tests, and other development tools used by the project.[5]
The software supports interactive terminal sessions, image input, approval consent, and sandboxing controls governing which commands the agent may execute.[6]
Codex CLI can connect to external tools and services through the Model Context Protocol (MCP), allowing additional capabilities to be exposed to the agent through configured MCP servers.[7]
Codex CLI can use both locally hosted and remote large language models. Local models can be served through Ollama or LM Studio,[8][9] while external model providers can be configured through compatible APIs, including OpenRouter.[10]
See also
[edit]External links
[edit]References
[edit]- ↑ Wiggers, Kyle (April 16, 2025). "OpenAI debuts Codex CLI, an open source coding tool for terminals". TechCrunch. Retrieved August 28, 2026.
- ↑ Edwards, Benj (January 26, 2026). "OpenAI spills technical details about how its AI coding agent works". Ars Technica. Retrieved August 28, 2026.
- ↑ Franzen, Carl (May 16, 2025). "OpenAI launches research preview of Codex AI software engineering agent for developers — with parallel tasking". VentureBeat. Retrieved August 28, 2026.
- ↑ Edwards, Benj (April 16, 2025). "OpenAI releases new simulated reasoning models with full tool access". Ars Technica. Retrieved August 28, 2026.
- ↑ "Codex CLI review: OpenAI's terminal coding agent tested". Dev AI Reviews. July 2026. Retrieved August 28, 2026.
- ↑ Heller, Martin. "OpenAI Codex rivals Claude Code". InfoWorld. Retrieved August 28, 2026.
- ↑ "OpenAI Codex CLI". MESCIUS Developer Solutions. MESCIUS USA. Retrieved August 28, 2026.
- ↑ "Codex". Ollama. Retrieved August 28, 2026.
- ↑ "Codex". LM Studio. Retrieved August 28, 2026.
- ↑ "How to Use OpenAI Codex CLI with OpenRouter". OpenRouter. June 17, 2026. Retrieved August 28, 2026.