AI Coding & Development · Coding Agent
OpenAI Codex: Features, Pricing, Pros & Cons
By OpenAI · Listing checked 2026-10-31
OpenAI Codex by OpenAI: OpenAI's coding agent that works in the cloud, the terminal (Codex CLI) and IDEs to write, review and fix code. Features, pricing model, pros, cons and alternatives.
Quick facts
Paid
AI Coding & Development
Not listed
OpenAI
OpenAI Codex does not have a meaningful free plan in our records. Look for a trial or demo before paying.
Main features of OpenAI Codex
- Cloud tasks that run in parallel
- Codex CLI for the terminal
- IDE extension
- Code review on pull requests
- Connects to GitHub repositories
Feature availability can vary by plan, region and product updates.
Pros and limitations
Pros
- Included with ChatGPT paid plans
- Runs several tasks at once
- Open-source CLI
Things to consider
- Requires an eligible ChatGPT plan or API
- Agent output still needs review
Who should use OpenAI Codex?
OpenAI Codex is a good fit if you regularly need help with:
- Delegating coding tasks
- Reviewing pull requests
- Writing tests
- Fixing bugs
On a budget? GitHub Copilot has a free option in the same category.
Before you pay: checklist for AI coding & developer tools
- Match the tool to your editor (VS Code, JetBrains, terminal) and your main languages.
- Test it on your real codebase: context across many files matters more than single-function demos.
- Check privacy terms if your code is proprietary — some offer no-training or self-hosted options.
- For app builders, check whether you can export the code and host it yourself.
Keep in mind: Generated code can contain bugs and security issues. Review changes, run tests and never paste secrets such as API keys into prompts.
OpenAI Codex FAQ
What is OpenAI Codex used for?
OpenAI's coding agent that works in the cloud, the terminal (Codex CLI) and IDEs to write, review and fix code. Common uses include delegating coding tasks, reviewing pull requests, writing tests.
Is OpenAI Codex free?
OpenAI Codex does not have a meaningful free plan in our records. Look for a trial or demo before paying. Prices and limits change, so confirm on the official pricing page.
Who makes OpenAI Codex?
OpenAI Codex is developed by OpenAI. Visit the official website for support, terms and privacy information.
What should I check before choosing OpenAI Codex?
Match the tool to your editor (VS Code, JetBrains, terminal) and your main languages. Test it on your real codebase: context across many files matters more than single-function demos.