Codex CLI and Codex App are two ways to work with Codex, not different models. The CLI runs in a terminal and fits command-line work, remote machines, and workflows built around codex exec. The App is a desktop interface for managing several tasks, reviewing diffs visually, and organizing projects. The right choice mainly depends on your environment and how many tasks you run in parallel.
Codex CLI vs Codex App: the short answer
OpenAI describes the App as another interface to the same Codex. It picks up session history and configuration from the CLI and IDE extension. The workflows are still different:
| Dimension | Codex CLI | Codex App |
|---|---|---|
| Primary interface | Terminal and TUI | Desktop application |
| Environment | Local or remote command line | Local graphical interface |
| Parallel work | Separate processes, non-interactive commands, and agent workflows | Multiple threads, projects, and built-in worktrees |
| Change review | Terminal diff and review commands | Visual diff, comments, and editor handoff |
| Skills | Available from the CLI and project | Available with a management interface |
| Automation | codex exec, shell, and an external scheduler |
Scheduled tasks with a result review queue |
| Best fit | People who already work in a terminal | People managing several tasks with visual oversight |
A custom API example for the CLI
The BetterToken guide for Codex CLI configures a custom provider with the Base URL https://bettertoken.ai/v1 and the OpenAI Responses protocol. This setup is verified for the CLI specifically and should not be assumed to work in Codex App without a separate check. If this access method fits your workflow, open the guide and verify the current configuration before starting.
How the interface and runtime environment differ
Codex CLI runs inside your current terminal. The codex command starts the interactive mode, while codex exec runs tasks non-interactively. This is useful on a remote machine over SSH, in a container, or inside an existing shell process. The official README lists the current installation options for macOS, Linux, and Windows.
Codex App organizes work into projects and threads. From one window, you can open the context of a task, inspect changed files, comment on a diff, and send changes to an editor. At the time of this review, OpenAI's official materials list the desktop app for macOS and Windows. Check the current official page for supported systems and installation methods, because those details change faster than the basic interface choice.
How parallel tasks and worktrees are handled
The CLI is not limited to one task: you can run separate processes, use non-interactive mode, and use Codex agent capabilities. However, arranging working directories, terminals, and results is usually part of your own workflow.
In the App, parallel work is part of the main interface. Threads separate task context, while built-in Git worktree support lets agents work in independent copies of the same repository. This reduces the chance of changes from two tasks landing in one working directory. A worktree still does not replace code review: inspect the diff and run the project's tests before merging a branch.
Where diff review is more convenient
In the CLI, review stays inside the terminal workflow: inspect the diff, request a review, and continue with regular Git commands. This works well when the terminal is already your main interface and another window would only add friction.
The App shows changes next to the task conversation. OpenAI specifically documents commenting on a diff and opening files in an editor. This format helps when you switch quickly between several tasks or when a reviewer does not want to reconstruct context from multiple terminal windows.
In both interfaces, the user remains responsible for the result. Permission to edit files does not mean a change should be published or merged without review.
Skills and automation: similar capabilities, different controls
Skills are reusable instructions, resources, and scripts for recurring tasks. OpenAI states that a skill created in the App can also be used in the CLI and IDE extension. The presence of Skills alone therefore does not decide between the two interfaces.
The difference is clearer in recurring work. In the CLI, codex exec, a shell script, and an external scheduler are natural building blocks. The App provides Scheduled tasks: work runs on a schedule and the result appears in a review queue. That interface is convenient for periodic checks, but it does not remove the need to review permissions, sources, and final actions.
What to choose for a specific workflow
A developer with a terminal-based workflow
Choose the CLI when most work already happens in a terminal, tasks run on remote machines, or Codex needs to become part of a script. The CLI is also a natural fit for short changes in one working directory and reproducible non-interactive commands.
A developer managing several tasks
The App is more convenient when a bug fix, a new feature, and a review are in progress at the same time. Projects, threads, visual diffs, and built-in worktrees put those tasks in one management surface. You can run the CLI in parallel as well, but you need to assemble the coordination layer yourself.
An analyst or data specialist
The choice depends on where the work lives. The CLI fits commands, file transformations, and reproducible scripts. If the priority is overseeing several research, document, or change threads, the App gives a clearer overview. In either case, verify calculations and sources separately from the agent's prose.
An operations or marketing specialist
The App is usually easier when a task does not begin with a terminal command: gathering material, preparing a document, or scheduling a periodic check. A graphical interface does not make the process fully autonomous. Before external publication, review facts, rights to materials, links, and final wording.
What to verify on official pages before installation
Several conditions change over time, so do not rely on an old comparison for them:
- whether the current CLI or App supports your operating system;
- which installation method OpenAI currently recommends;
- which sign-in and payment options are available to your account;
- which App capabilities are equally available on macOS and Windows;
- which sandbox permissions the agent receives in the selected environment;
- where scheduled tasks run and when the computer must remain online.
Use the current Codex CLI README, Codex documentation, and Codex App page for verification. Old version numbers, plan lists, and dates from third-party comparisons are not reliable inputs for this decision.
The final choice
Choose Codex CLI if terminal work, SSH, scripts, and your own orchestration already define the workflow. Choose Codex App if you need to manage several threads, isolate work through worktrees, and inspect changes visually. The two can be combined: OpenAI's official materials explicitly describe shared history and configuration across Codex surfaces.