OpenAI Codex

★★★★☆4.5 / 5 editorial Paid Included with ChatGPT plans — Paid plans from $20/mo (Plus); the Codex CLI is open source.

OpenAI's cloud coding agent — delegate tasks, review the pull request

✓ Editor-verified listing — details reviewed by Grab AI Tool editors; pricing re-checked regularly.

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#coding agent#pull requests#chatgpt#refactoring#task automation

What is OpenAI Codex?

OpenAI Codex is a cloud-based software engineering agent included with ChatGPT plans: you delegate coding tasks — features, bug fixes, refactors, questions about the codebase — and Codex works on them in parallel sandboxes preloaded with your repository, returning reviewable diffs and pull requests. A companion open-source CLI brings the same agent into your terminal.

Codex reads an AGENTS.md file in your repository so it follows your project's build, test, and style conventions, and every run shows its citations and terminal logs for verification. Access rides on your ChatGPT subscription rather than a separate bill, though heavy parallel use consumes plan limits quickly, and cloud tasks need a GitHub-hosted repository to start.

Key Features

Runs delegated coding tasks in parallel sandboxes
Returns pull requests with logs and citations
Follows your AGENTS.md project conventions
Open-source CLI for local terminal workflows
Powered by OpenAI's code-specialised models

Pros

Excellent on parallel, well-defined tasks
No separate subscription beyond ChatGPT
Transparent logs make verification easy

Cons

Cloud agent needs a GitHub-hosted repository
Heavy use burns through plan limits
Long tasks can drift without tight instructions

Pricing

Model: Paid
Included with ChatGPT plans — Paid plans from $20/mo (Plus); the Codex CLI is open source.

Adding Up Your AI Bill?

If you pay for OpenAI Codex alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.