[BUG] /extra-usage enabled but cannot switch to Opus model

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Description:

After successfully enabling /extra-usage, attempting to switch to Opus fails with an error incorrectly stating
that extra-usage needs to be turned on.

Environment:

• Claude Code version: 2.0.54
• Platform: macOS (Darwin 25.1.0)
• Plan: Claude Pro with /extra-usage enabled

Steps to reproduce:

1. Run /extra-usage → Response: "Login successful"
2. Run /model opus or /model claude-opus-4-5-20250514
3. Error received: "Your Pro plan doesn't include Opus in Claude Code. Turn on /extra-usage or /upgrade to Max

to access it."

1. Restart Claude Code completely
2. Run /extra-usage again → Still shows "Login successful"
3. Try /model opus again → Same error

What Should Happen?

Expected behaviour:
Should successfully switch to Opus model with pay-as-you-go billing.

Actual behaviour:
Model switch fails despite extra-usage being enabled and authenticated.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Run /extra-usage → Response: "Login successful"
2. Run /model opus or /model claude-opus-4-5-20250514
3. Error received: "Your Pro plan doesn't include Opus in Claude Code. Turn on /extra-usage or /upgrade to Max

to access it."

1. Restart Claude Code completely
2. Run /extra-usage again → Still shows "Login successful"
3. Try /model opus again → Same error

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.0.54

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_