Back in May, OpenAI announced Codex, a cloud-based software engineering agent that can perform multiple software engineering tasks in parallel. Codex can read, modify, and run code, allowing developers to build faster, fix bugs, and understand new code.
Until today, Codex was accessible only via CLI. Now, OpenAI is announcing the new Codex extension for VS Code, Cursor, and other VS Code forks, so that developers can preview local changes and edit code when required. This new VS Code Codex extension is built around the open source Codex CLI. Once signed in with a ChatGPT account with an appropriate plan, developers can start using it without the need for API key setup.
The Codex VS Code extension is available on macOS and Linux. The Windows support is still in an experimental state, and OpenAI recommends using Codex with the Windows Subsystem for Linux. The new Codex extension can be installed from the Visual Studio Code marketplace, or downloaded using the links below:
- Download for Visual Studio Code
- Download for Cursor
- Download for Windsurf
- Download for Visual Studio Code Insiders
With Codex"s availability for IDEs, developers can now pair with Codex locally and then assign tasks to the cloud to execute asynchronously without losing state. To do that, developers need to set up a cloud environment for Codex to work in. Once done, they can select the environment and use the "Run in the cloud" option.
With these updates, Codex works as one agent across your IDE, terminal, cloud, GitHub, and even on your phone — all connected by your ChatGPT account.
— OpenAI Developers (@OpenAIDevs) August 27, 2025
It’s all included in Plus, Pro, Team, Edu, and Enterprise plans. Check out the new Codex developer hub to get started.…
Finally, developers can now set up Codex to automatically review new PRs in a repository. Developers can also create ad-hoc review requests by mentioning @codex in PRs to get reviews and suggested fixes.