OpenAI Codex

Coding agent from OpenAI for building features, refactoring code, testing, and reviewing changes.

Pricing

ChatGPT's Free plan includes limited Codex access; paid plans provide expanded or maximum Codex usage.

Overview

OpenAI Codex is a coding agent for software engineering work. It can handle feature development, refactors, migrations, testing, and code review. Codex runs across ChatGPT, an IDE extension, and the terminal, with cloud environments and worktrees for parallel tasks. Teams can give it Skills that describe coding standards and workflows, and schedule background work such as issue triage or CI/CD tasks.

Key features

Feature development and code changes
Refactoring and migration work
Code testing and review
ChatGPT, IDE, and terminal access
Cloud environments and built-in worktrees
Parallel agent workflows
Skills for team standards
Scheduled background tasks

Use cases

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Last updated 2026-09-16