Codex CLI vs Codex App: What's Different and Which to Choose

Codex CLI vs Codex App: What’s Different and Which Should You Choose?

Quick answer: choose Codex CLI when your work already lives in a terminal, over SSH, in containers, or in scripts built around codex exec. Choose the desktop App when you need several parallel tasks, built-in worktrees, and a visual diff. They are two Codex interfaces, not different models. If you use a custom provider, the client also changes how authentication should be configured.

The interface and configuration details below were checked on August 11, 2026 against current OpenAI and BetterToken documentation.

CLI vs desktop App at a glance

Decision point	Codex CLI	Desktop App
Main interface	Terminal and TUI	Graphical desktop application
Best environment	Local shell, SSH, container, remote machine	Local computer, multiple projects and threads
Parallel work	Built-in subagents switched with /agent, separate processes, and codex exec	Multiple threads, built-in worktrees, and visual result management
Reviewing changes	Terminal diff and standard Git commands	Visual diff, comments, editor handoff
Repeated work	Shell scripts and an external scheduler	Automations with a result queue for review
Custom provider	Shared ~/.codex/config.toml; key supplied through an environment variable	Uses the same config file; requires a complete restart after changes

OpenAI says the desktop App can pick up session history and configuration from the CLI and IDE extension. That makes it practical to combine the interfaces, but each process still has its own environment, restart cycle, and verification step. Subagents are available in both CLI and App; the App’s advantage is the visual management of threads, worktrees, and diffs, not exclusive access to parallel work.

Where a custom provider fits

BetterToken is a pay-as-you-go API service for OpenAI-compatible tools. It does not replace the Codex client, a ChatGPT account, or the desktop application. For Codex, the current BetterToken setup uses a custom provider, Base URL `https://www.bettertoken.ai/v1%60,?utm_source=blog&utm_medium=organic_content&utm_campaign=SEO-050&utm_content=codex-cli-ili-codex-app and the Responses protocol.

First identify where the task is running:

1. A codex command in Terminal is the CLI.
2. A Codex task in the desktop application is the App.
3. A Codex panel inside VS Code is the extension.

CLI and the desktop App share ~/.codex/config.toml (on Windows, %USERPROFILE%\.codex\config.toml). For those two clients, the BetterToken key is read from BETTERTOKEN_API_KEY through the provider’s env_key, and the custom provider does not require OpenAI authentication. The VS Code extension uses a different documented authentication path while preserving the official sign-in.

Do not add two [model_providers.custom] sections to the same TOML file. Choose the authentication pattern for the client you are testing. Check the current fields and Model ID in the CLI and desktop guide or the separate VS Code guide.

The desktop App and IDE extension may not inherit a variable defined only in your shell profile. If the new process cannot see BETTERTOKEN_API_KEY, place it in ~/.codex/.env as documented by OpenAI, fully restart the client, and open a new session. Never put the key in an article, screenshot, or shared repository.

How to verify the selected provider

After changing the configuration:

1. Fully close the old Codex process.
2. Open a new terminal or restart the desktop App. In VS Code, run Developer: Reload Window.
3. Create a new session and send a short task with little context.
4. In the CLI, open /status and check the active provider. For every client, match the test request by time and model in the BetterToken Dashboard.

A response without sign-in, 401, 403, or model not found errors is only a health check. A matching /status value or BetterToken Dashboard request is the observable proof that the model call used BetterToken.

Choose by workflow

Choose CLI for terminal-first development, remote machines, containers, reproducible commands, and scheduled scripts. The CLI also has built-in subagent workflows and /agent; you still decide how working directories and final changes are reviewed.

Choose the desktop App when a bug fix, feature, and review need separate threads; when built-in worktrees reduce working-directory conflicts; or when a visual diff is easier than reconstructing context across terminal windows.

Use both when the CLI handles remote or automated execution and the App handles task management and review. Before each run, verify the working directory, permissions, active provider, and authentication method.

Common provider errors

It works in CLI but not in VS Code

The CLI/App and extension use different authentication fields. Do not copy the env_key pattern into the extension as a complete solution. Follow the extension-specific guide, reload the window, and start a new session.

Codex asks for the official sign-in again

For a custom provider in CLI/App, confirm that BETTERTOKEN_API_KEY is available to the newly started process. For the VS Code extension, keep the official sign-in and configure the model-request credential using its documented field.

Provider or model is not found

model_provider = "custom" must match [model_providers.custom]. Remove duplicate sections, confirm wire_api = "responses", and re-check the current Model ID.

The file changed but behavior did not

Restart the client and create a new session. If the App cannot see a shell variable, use ~/.codex/.env and restart again. Then check one variable at a time: Model ID, API key, Base URL, and authentication mode.

Final recommendation

Pick Codex CLI for terminal, SSH, scripts, and self-managed orchestration. Pick the desktop App for parallel threads, built-in worktrees, and visual review. For a custom provider, select the client first, apply the matching authentication method, and verify it in a short new session.

As of August 11, 2026, the new ChatGPT desktop application with Chat, Work, and Codex is available for macOS and Windows. Existing Codex App users update normally; first-time users should use the official ChatGPT download page. Names and navigation can change after an update, so also check the current desktop migration guide.