VerlumoAIAI coding agents that write, test, and review code across your whole codebase.
View detailsOpenAI Codex
OpenAI's cloud-based coding agent that takes on software tasks, runs tests, and opens pull requests on your behalf.
OpenAI Codex is a cloud-based coding agent that takes on software tasks on your behalf. Give it a task in plain language, and it clones your repository, writes the code, runs the tests, and opens a pull request for your review. It works in the background, so you can hand it several tasks and check the results as they arrive.
Key Features
- Cloud agent that completes tasks and opens pull requests
- Runs your test suite in a sandboxed environment
- Handles bug fixes, features, tests, and refactors
- Explains its changes for easy code review
- Available in ChatGPT and as a CLI tool
- Works in the background on multiple tasks
Pricing
| Plan | Price | Details |
|---|---|---|
| ChatGPT Plus | $20/mo | Codex access with standard usage limits, plus ChatGPT. |
| ChatGPT Pro | $200/mo | Much higher Codex usage limits and access to the most capable models. |
| API | Pay as you go | Usage-based pricing for API-driven Codex use. |
Prices as listed in 2026 research. Always check the official site for the latest price — plans change. Free plan: No free plan — paid plans only.
Best for: teams who want an AI agent to handle routine coding tasks end to end, from issue to pull request.
Popular with: Developers, Business Owners
Popular with: Developers, Business Owners
How it works
Codex is built for real engineering work: fixing bugs, adding features, writing tests, and refactoring. It runs in a sandboxed cloud environment with access to your code and your test suite, and it explains what it changed so reviewers can follow its reasoning. It is available through ChatGPT and as a command-line tool.
Codex is included with ChatGPT Plus at $20 per month and Pro at $200 per month, with usage limits that vary by plan, and API access is billed by usage. It suits teams with a steady stream of well-defined tasks; for quick one-off edits, an in-IDE assistant is usually faster.
Pros and Cons
✓ Pros
- Handles whole tasks, not just code snippets
- Runs tests and opens pull requests for review
- Works asynchronously in the cloud
- Backed by OpenAI's most capable coding models
✗ Cons
- Requires a paid ChatGPT plan — no standalone free tier
- Cloud agent can be slower than working in your own IDE
- Needs review: agent output is not always correct first time
Frequently Asked Questions
Is OpenAI Codex free?
No — OpenAI Codex has no free plan. Included with ChatGPT Plus from $20/mo
What is OpenAI Codex best for?
teams who want an AI agent to handle routine coding tasks end to end, from issue to pull request.
What kind of tool is OpenAI Codex?
OpenAI Codex is a Coding Assistants tool on VerlumoAI.
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View detailsLast reviewed: November 2026