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OpenAI – ChatGPT Plus/Pro

Why this video matters: it shows the exact sign-in flow and where to click in the Roo Code settings panel.

Use Codex models in Roo Code without an OpenAI API key. Just sign in with the ChatGPT account you already pay for.

If you want the official OpenAI API (API keys, usage-based billing, broader model availability), use the regular OpenAI provider instead: Using OpenAI With Roo Code.

Quickstart: sign in and run a task​

  1. Open Roo Code settings (click the gear icon in the Roo Code panel).
  2. In API Provider, select OpenAI – ChatGPT Plus/Pro.
  3. Click Sign in to OpenAI Codex.
  4. Finish the sign-in flow in your browser.
  5. Back in Roo Code settings, pick a model from the dropdown.
  6. Start a task.

What you can't do (and why)​

  • You can't use arbitrary OpenAI API models. This provider only exposes the models listed in Roo's Codex model catalog.
  • You can't export/migrate your sign-in state with settings export. OAuth tokens are stored in VS Code SecretStorage, which isn't included in Roo's settings export.
  • You can't sign in if Roo can't bind localhost:1455. The OAuth callback uses a local server; if your machine (or security software) blocks it, the flow can't complete.

Troubleshooting​

Not authenticated with OpenAI Codex (or Roo asks you to sign in)​

  • Symptom: Roo fails immediately and tells you to sign in.
  • Cause: You haven't completed OAuth sign-in, or your stored refresh token was revoked and Roo cleared it.
  • Fix: In the provider settings panel, click Sign in to OpenAI Codex again.
  • Prevention: Don't delete VS Code extension secrets unless you expect to re-auth.

Port 1455 is already in use during sign-in​

  • Symptom: Sign-in fails right away and mentions port 1455.
  • Cause: Another process is listening on that port.
  • Fix: Stop the process using 1455, then retry sign-in.
  • Prevention: Avoid running other local OAuth callback servers on the same port.

403 Forbidden or Model not available​

  • Symptom: Requests fail with access denied.
  • Cause: Your ChatGPT subscription or organization doesn't have access to that model.
  • Fix: Pick a different model, or verify your account/org subscription.
  • Prevention: Treat the model list in the provider settings as the source of truth.

Cost shows as $0​

  • Symptom: Roo shows usage but cost is zero.
  • Cause: This provider is subscription-covered, so Roo intentionally reports cost as $0.
  • Fix: Nothing to fix.
  • Prevention: Don't treat $0 as “no tokens consumed”; it's “not billed per token in Roo”.