[BUG] /model → Fable 5 blocks on usage credits, ignoring active promotional weekly allowance

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?

Claude Code CLI's /model command blocks selecting Fable 5 with a
"you have $0.00 in credits" message, even while the account still has
a large remaining balance in Anthropic's separate *promotional weekly
Fable allowance* (shown in claude.ai web → Settings → Usage → "Fable").
claude.ai web chat correctly honors this promotional allowance and lets
Fable 5 through; Claude Code CLI does not.

Claude Code immediately shows:

Switch to Fable 5?
Fable 5 runs on usage credits — you have $0.00 in credits.
Learn more: https://support.claude.com/en/articles/12429409-extra-usage-for-paid-claude-plans
> 1. Buy usage credits

1. No, keep my current model

This happens regardless of remaining promotional allowance — Claude
Code appears to check only the paid usage-credits balance, not the
promotional weekly Fable quota that gates the web app.

What Should Happen?

Claude Code should check the same account-level promotional Fable
allowance that claude.ai web checks, and allow the switch while
allowance remains (same account, same promo period).

Error Messages/Logs

Switch to Fable 5?
    Fable 5 runs on usage credits — you have $0.00 in credits.
    Learn more: https://support.claude.com/en/articles/12429409-extra-usage-for-paid-claude-plans
    > 1. Buy usage credits
      2. No, keep my current model

Steps to Reproduce

1. On a Pro plan account currently inside the Fable 5 promotional period

(through 2026-07-07), confirm remaining allowance at
claude.ai → Settings → Usage → "Fable" (e.g. 40% used / 60% remaining).

1. In claude.ai web chat, switch the model to Fable 5 — works normally,

no credit prompt.

1. In Claude Code CLI, run /model and select "Fable" from the list.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.200 (Claude Code)

Claude Code Version

2.1.200 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1357" height="394" alt="Image" src="https://github.com/user-attachments/assets/7a0d572c-194a-484c-91f1-b33a861d8e9f" />
<img width="1357" height="394" alt="Image" src="https://github.com/user-attachments/assets/aa4b2a4f-28f4-491c-b3a4-3f119a9fe3eb" />
<img width="1357" height="394" alt="Image" src="https://github.com/user-attachments/assets/db62da8b-1dd5-42e9-a3de-9e074143c0e8" />