Codebase-aware development
Select a project or folder so Codex can work with the relevant codebase context while helping build features, investigate issues, and modify files.
TOOL PROFILE TOOLAI
OpenAI Codex
AI-assisted software development across desktop, web, terminal, editors, and cloud environments
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THE BIG PICTURE
About OpenAI Codex
Codex is available through ChatGPT surfaces and can also use an API key. Developers can start with a goal, task, files, or additional context, then choose local work or a reusable Codex Cloud environment for remote coding tasks. The product relationship is direct: ChatGPT provides the broader conversational workspace, while Codex is the development-focused mode.
A CLOSER LOOK
See it in action
Explore product screens and published examples. Open any image for a closer look.
WHAT YOU CAN DO
A toolkit worth exploring
Get to know the capabilities. Find your own way to use them.
Build and debug workflows
Use the Codex mode in ChatGPT for software development tasks such as building new functionality, debugging problems, and working through failures.
Code review assistance
Ask Codex to review code and suggest changes, making it useful for examining proposed implementations before they are accepted or shipped.
Local file access
The desktop app can read and modify files in a folder you choose, supporting development work directly against local projects and files.
Cloud development environments
Create a reusable Codex Cloud environment from the web or desktop app; Codex inspects repositories and helps prepare and test the setup.
Multiple developer surfaces
Developers can use Codex through ChatGPT, Codex CLI in a terminal, the Codex IDE extension, or Codex Cloud for remote work.
Cross-device cloud continuation
After publishing a cloud environment, users can start and continue cloud tasks on the web, mobile, or desktop app.
API-key access
The desktop setup supports signing in with a ChatGPT account and may also allow Codex use with an API key.
MADE FOR YOUR WORKFLOW
Where it fits into your day
Implement a repository feature
Select a project, describe the desired behavior, provide relevant context, and use Codex to explore the codebase and propose or make the required changes.
Investigate a failing workflow
Give Codex the affected project and explain the failure, then use its development context to inspect relevant files and work toward a fix.
Review changes before shipping
Ask Codex to examine an implementation and suggest changes, then manually validate the recommendations with tests, code review, and security checks.
YOUR FIRST STEPS
From first click to first result
Choose an access surface
Open ChatGPT on the web or install the desktop app; developers can alternatively use Codex CLI, the IDE extension, or Codex Cloud.
Sign in or provide access
Sign in with a ChatGPT account, or use an API key where supported by the selected setup.
Select the development context
Start a Codex chat, choose a project or folder, or create a cloud environment for a repository-based remote task.
Describe the task
State the goal clearly and add the files, codebase context, or other information Codex needs to work effectively.
Review the result
Inspect suggested or completed changes, run appropriate tests, and confirm the implementation meets your technical and security requirements.
TAKE A LOOK AROUND
Get a feel for the real thing
Explore the tool's demo or video to see its interface and workflow.
PLAN YOUR NEXT STEP
A plan for the way you work
Sign in with an eligible ChatGPT account or connect an API key. Subscription allowances and API usage billing are separate access methods.
PLAN
ChatGPT access
Use Codex from the ChatGPT web or desktop experience with a ChatGPT account.
- Web access
- Desktop access
- Codex development mode
PLAN
Codex CLI or IDE extension
Use Codex from a terminal or supported code editor.
- Terminal workflow
- Editor workflow
PLAN
Codex Cloud
Create a reusable cloud environment for remote coding work and continue tasks across supported ChatGPT surfaces.
- Repository-based environment
- Web access
- Desktop access
- Mobile continuation
Prices, usage limits and terms can change. Confirm the latest details on the tool's official website before subscribing.
Sources checked
What is OpenAI Codex?
Codex is ChatGPT’s software-development mode for building, debugging, reviewing, and shipping code with codebase context and developer tools.
How is Codex related to ChatGPT?
ChatGPT is the broader workspace, while Codex is the development-focused option in the ChatGPT selector.
Can Codex work with local files?
Yes. In the desktop app, select a folder and ChatGPT can read and modify files within that chosen folder.
Can I use Codex remotely?
Yes. Codex Cloud provides reusable cloud environments for remote coding work, with tasks continuing on web, mobile, or desktop.
Can I use Codex in a terminal or editor?
Yes. Use Codex CLI for terminal use and the Codex IDE extension for code-editor workflows.
Does Codex require a ChatGPT account?
The desktop quickstart describes signing in with a ChatGPT account and also says Codex may be used with an API key; some features may not be available with an API key.
FROM THE COMMUNITY
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MAKE YOUR NEXT MOVE
Ready to explore OpenAI Codex?
Visit the official website to explore the latest features and get started.
OpenAI Codexopenai.com
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