1# Codex environments

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3In the ChatGPT desktop app, open the ChatGPT dropdown and select **Codex**.

4When starting a Codex task, choose where it runs:

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6- **Local**: work directly in your current project directory.

7- **Worktree**: isolate changes in a Git worktree. [Learn more](https://learn.chatgpt.com/docs/environments/git-worktrees).

8- **Cloud**: run remotely in a configured cloud environment.

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10Both **Local** and **Worktree** tasks run on your computer.

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12For the full glossary and concepts, explore the [concepts section](https://learn.chatgpt.com/docs/prompting).

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14<CodexScreenshot

15 alt="New task composer with Local, Worktree, and Cloud environment options"

16 lightSrc="/images/codex/app/modes-light.webp"

17 darkSrc="/images/codex/app/modes-dark.webp"

18 maxHeight="400px"

19 class="my-8"

20/>