What is OpenAI Codex?

OpenAI Codex is a cloud-based software engineering agent that can write features, fix bugs, answer questions about your codebase, and propose pull requests from natural language prompts.

Who can access OpenAI Codex?

Codex is available to ChatGPT Pro, Business, and Enterprise users, and is being rolled out to Plus and Edu users.

What programming languages does Codex support?

Codex supports a wide range of popular programming languages, frameworks, and libraries, enabling code generation, refactoring, and understanding across multiple stacks.

How does Codex write and review code?

Powered by the codex-1 model optimized for software engineering and trained via reinforcement learning on real-world tasks, Codex can work in parallel and iteratively test code until it meets specified criteria.

Can Codex help with debugging or optimizing code?

Yes. Codex can fix bugs, explain complex logic, and refactor and optimize code to improve efficiency and maintainability while preserving intended behavior.

Is Codex available in my preferred development environment?

Yes. Codex integrates via a CLI and a VS Code extension and can also be used from an IDE terminal, making it compatible with many development setups.

Does OpenAI use my code or prompts submitted to Codex for model training?

For Business, Enterprise, and Edu users, OpenAI does not use inputs or outputs from Codex by default to improve models. Pro and Plus users can disable training in ChatGPT data controls.

Can Codex automate repetitive engineering tasks?

Yes. Codex can automate tasks such as writing tests, renaming, refactoring, and scaffolding projects so developers can focus on higher‑value work.

What are the “Insert” and “Edit” capabilities of Codex?

Insert and Edit let you add contextually relevant text within existing code or modify code based on instructions, making updates and refactors efficient.

How do I get started with Codex?

Review the Codex Overview documentation, explore best practices, and use the built‑in guides to integrate Codex for code generation, understanding, and optimization.

Codex

Name: Codex
Brand: Codex
Availability: InStock
Rating: 5 (1 reviews)
Author: OpenAI

By OpenAI

0 reviews

Freemium

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What is Codex?

OpenAI Codex is a cloud-based AI coding agent that transforms natural language into production-ready code, automates code reviews, and integrates seamlessly with IDEs, CLIs, and GitHub to accelerate development across multiple programming languages while boosting developer productivity and code quality.

AI Assistant

Codex's Top Features

Key capabilities that make Codex stand out.

Automated code generation and modification from natural language prompts

Code understanding and codebase Q&A

Cloud and local execution with stateful handoff between environments

Parallel and proactive task handling in isolated sandboxes

Automated pull request reviews with runnable validation and suggestions

IDE and CLI integration, including a VS Code extension

Secure authentication with multi‑factor support

Pull request creation and proposal automation

Reinforcement learning on real‑world codebases for iterative, instruction‑following behavior

Seamless GitHub repository integration for continuous delivery and faster iteration

Codex's pricing

Key Details

Category: AI Assistant
Pricing Model: Freemium
Website: Visit Codex
Last Updated: March 8, 2026

About the Maker

The organization behind Codex.

OpenAIai lab

Creating safe AGI that benefits all of humanity

234 Tools6 ModelsFounded 2015San Francisco, CA

View full profile

AI Models by OpenAI

Large language models from the same organization.

Model	Context Window	Price (In / Out per M)	Capabilities
GPT-5.4Current	1.1M	$2.50 / $15.00	textvisioncodetool use+2
GPT-5.3 CodexCurrent	400K	$1.75 / $14.00	textvisioncodetool use+2
o3Current	200K	$10.00 / $40.00	textvisioncodetool use+1
GPT-4o miniCurrent	128K	$0.15 / $0.60	textvisioncodetool use
GPT-4oCurrent	128K	$2.50 / $10.00	textvisioncodetool use+1
GPT-5	400K	$1.25 / $10.00	textvisioncodetool use+1

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