Codex CLI

Codex CLI

OpenAI
Reason

Reason

Reason Machines
+
+

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About

Codex CLI is an open-source, lightweight coding agent that integrates directly into your terminal, designed to help developers write, edit, and understand code efficiently. By pairing with Codex CLI, developers can leverage the power of AI to streamline their workflow, get real-time code suggestions, and improve their coding accuracy, all from within their command line interface. It provides a seamless, accessible way to enhance coding productivity while staying in the environment developers are already comfortable with.

About

Reason is an autonomous software engineer and AI coding agent designed to take ownership of real engineering work, from researching codebases and fixing bugs to implementing features and verifying results. It works across connected repositories, local computers, and cloud environments, allowing developers to delegate tasks without interrupting their workflows. The agent can explore codebases, trace call paths, reproduce failures, edit files, run tests, and produce verified pull requests for human review. Its research capabilities provide evidence-backed findings with citations linking directly to source files and lines, while repository memory preserves knowledge for future sessions. Reason supports parallel subagents, isolated workspaces, scheduled sessions, and automated workflows for development and operations. Teams can connect repositories, manage permissions, inspect code changes, and review builds, regression tests, and deployment checks before merging.

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Codex CLI is ideal for developers and software engineers looking to enhance their coding efficiency, automate repetitive tasks, and improve code quality using AI-powered assistance directly within their command line environment

Audience

Software developers, engineering teams, and DevOps searching for a tool to automate coding tasks, investigate codebases, resolve issues, and streamline software development

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Open source
Free Version Supported
Free Trial Not Supported

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Pros & Cons from Real Users

Pros

  • Codex CLI is great because it brings OpenAI’s coding agent directly into the terminal. I like that it fits into a normal developer workflow instead of forcing everything through a separate web app or IDE extension. It can read, modify, and work with code locally, which makes it useful for debugging, refactoring, exploring a repo, and handling coding tasks without leaving the command line. That is especially nice for developers who already live in terminal-first workflows. I also like that it is part of the broader Codex ecosystem. If I want the same general agent experience in an IDE, desktop app, or ChatGPT’s cloud-based Codex, there are options for that too.

Cons

  • I would still supervise it closely. Any AI coding agent that can touch local files and interact with a dev environment needs review, tests, and clear boundaries. It can also run into the usual coding-agent issues: setup problems, API/config errors, terminal quirks, command failures, and tool-use mistakes. A recent empirical study of Claude Code, Codex, and Gemini CLI found that many reported bugs in these tools involve functionality, integrations, configuration, terminal behavior, and command execution.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

OpenAI
Founded: 2015
United States
openai.com

Company Information

Reason Machines
Founded: 2026
United States
reasonmachines.com

Alternatives

Amp

Amp

Amp Code

Alternatives

Augment Code

Augment Code

Harness
Claude Code

Claude Code

Anthropic
AtomCode

AtomCode

AtomGit

Categories

Agentic AI Supported
AI Agents Supported
AI Code Generators Supported
AI Coding Agents Supported

Categories

AI Agents Supported
AI Coding Agents Supported

Integrations

ADM Supported
Atomic AGI Supported
Bitdefender VPN for AI Agents Supported
C# Supported
CallMeMCP Supported
Dosi Supported
Emdash Supported
Fluq Supported
GPT-5.1-Codex-Max Supported
GPT-5.2 Thinking Supported
GPT‑5.3‑Codex‑Spark Supported
Gemmein Supported
Lanes Supported
Latent Supported
Melaya Supported
Morphy Supported
Raft Supported
React Supported
Selzee Supported
Whenever Supported

Integrations

ADM Not Supported
Atomic AGI Not Supported
Bitdefender VPN for AI Agents Not Supported
C# Not Supported
CallMeMCP Not Supported
Dosi Not Supported
Emdash Not Supported
Fluq Not Supported
GPT-5.1-Codex-Max Not Supported
GPT-5.2 Thinking Not Supported
GPT‑5.3‑Codex‑Spark Not Supported
Gemmein Not Supported
Lanes Not Supported
Latent Not Supported
Melaya Not Supported
Morphy Not Supported
Raft Not Supported
React Not Supported
Selzee Not Supported
Whenever Not Supported
Claim Codex CLI and update features and information
Claim Codex CLI and update features and information
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Claim Reason and update features and information