OpenCode ChatGPT Codex Usage

An OpenCode TUI plugin that shows ChatGPT Codex usage limits in the right sidebar.

The panel displays the current ChatGPT plan, whether Codex requests are allowed, used and remaining percentages, the duration of each usage window, and local reset times. By default, it refreshes every 30 seconds.

Requirements

• OpenCode 1.18.18 or newer
• A ChatGPT account connected to OpenCode with OAuth
• The OpenCode TUI right sidebar enabled

Install

Add the package to the TUI plugin list in ~/.config/opencode/tui.jsonc:

{
  "$schema": "https://opencode.ai/tui.json",
  "plugin": ["opencode-chatgpt-codex-usage"]
}

Preserve any existing entries in the plugin array. Quit and restart OpenCode after changing the configuration; config-time plugins are not hot-reloaded.

If ChatGPT is not connected yet, run /connect in OpenCode and select OpenAI/ChatGPT.

Refresh Interval

Set refreshInterval with a duration ending in s (seconds), m (minutes), h (hours), or d (days):

{
  "$schema": "https://opencode.ai/tui.json",
  "plugin": [
    ["opencode-chatgpt-codex-usage", { "refreshInterval": "5m" }]
  ]
}

The default is "30s". Valid durations shorter than 10 seconds are clamped to "10s"; invalid values fall back to the default. Quit and restart OpenCode after changing the interval.

Authentication

Credentials are checked in this order:

1. CHATGPT_ACCESS_TOKEN, with optional CHATGPT_ACCOUNT_ID.
2. OPENCODE_AUTH_CONTENT, containing OpenCode auth JSON.
3. OpenCode's auth file at $XDG_DATA_HOME/opencode/auth.json, or ~/.local/share/opencode/auth.json when XDG_DATA_HOME is unset.

The plugin reads the openai OAuth entry. When the account ID is absent, it attempts to derive it from JWT claims in the access token.

The token is used only as an authorization header for the usage request. It is not rendered, logged, written, or sent to model prompts.

Displayed Values

• Plan: the plan reported by ChatGPT, such as plus.
• Allowed: whether Codex requests are currently accepted.
• Primary: the primary usage window.
• Secondary: the longer usage window, when returned.
• used and left: consumed and calculated remaining percentages.
• window: duration from limit_window_seconds.
• reset: the reset time in the machine's locale.

Security And Stability

This plugin calls the undocumented internal endpoint:

https://chatgpt.com/backend-api/wham/usage

The endpoint and response schema may change without notice. OAuth access tokens are sensitive; install plugins only from sources you trust. A 401 or 403 response normally means the ChatGPT session must be reconnected with /connect.

Development

npm install
npm run typecheck
npm test
npm pack --dry-run

The npm package exposes both . and ./tui; OpenCode loads the TUI entrypoint from exports["./tui"].

Publishing

Confirm that the npm package name is still available, authenticate with npm login, and publish:

npm publish

License

MIT