Which platforms does Codex support?

Codex is available as a dedicated application for both macOS and Windows, and integrates directly into your preferred code editor and terminal.

How does Codex differ from standard coding assistants?

Codex functions as an autonomous coding agent capable of managing entire workflows, such as pull requests and system-wide refactoring, rather than just suggesting individual lines of code.

Can Codex perform tasks without constant prompting?

Yes, through Automations, Codex can handle routine but critical work like issue triage and CI/CD monitoring in the background while you focus on building.

How does Codex help maintain code quality?

Codex raises the bar by performing high-signal code reviews and generating comprehensive tests, ensuring that issues are caught early and your team ships with confidence.

Codex

OpenAI's AI coding agent that writes features, fixes bugs, and ships pull requests — while you sleep.

Development

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What is Codex?

Codex is OpenAI's cloud-based AI coding agent, built to handle real software engineering tasks end to end — not just autocomplete, but full task execution. Connect your GitHub repo and Codex can write new features, answer questions about your codebase, fix bugs, and open pull requests for review. Every task runs in its own isolated cloud sandbox, so multiple jobs can run in parallel without interfering with each other. It supports both async task delegation and real-time collaborative coding, making it feel like a live coding partner rather than a batch process you have to babysit.

What sets Codex apart from a standard code assistant is the multi-agent workflow: instead of working with AI one prompt at a time, you queue up tasks and let multiple agents work simultaneously across a project. Developers are using it to handle the implementation grunt work — CRUD operations, API endpoints, bug fixes, refactors — while staying focused on architecture and decisions that actually need a human. Available via ChatGPT, a desktop app for Mac and Windows, the CLI, and IDE integrations, Codex has grown to over 2 million weekly active users with adoption at companies like Cisco, Duolingo, and Vanta.

Key Features

Complete end-to-end tasks like complex refactors and migrations using OpenAI’s frontier coding models.
Leverage multi-agent workflows in cloud environments to complete weeks of work in a matter of days.
Utilize custom skills to align Codex with your team's specific coding standards for documentation and prototyping.
Deploy automated background agents to handle routine tasks like issue triage, alert monitoring, and CI/CD maintenance.
Improve baseline code quality with thorough automated reviews and comprehensive testing that catches bugs early.

Pricing Details

Free - $0/month
Explore Codex capabilities on quick coding tasks.
Go - $8/month
Use Codex for lightweight coding tasks.
Plus - $20/month
Power a few focused coding sessions each week. Includes access to the web, CLI, IDE extensions, cloud integrations, and the latest models like GPT-5.5.
Pro - From $100/month
Choose 5x or 20x higher rate limits than Plus. Includes access to GPT-5.3-Codex-Spark for day-to-day coding tasks.
API Key - Pay as you go
Great for automation in shared environments like CI. Pay only for the tokens Codex uses based on standard API pricing.