[Bug] Claude Fable 5 model incorrectly draws from usage credits on Max 20x plan, on Claude code

Bug Description
I am on Max 20x plan however, Fable 5 is not usable in Claude code, it says that Fable 5 draws from Usage credits

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.220
• Feedback ID: ea6d5873-79da-4f43-9d55-f3f49825883f

Errors

[]

 Switch to Fable 5?

   Fable 5 runs on usage credits, purchased separately from your plan.

   You don't have usage credits yet.

     1. Set up usage credits on claude.ai
   ❯ 2. No, keep my current model

⏺ Switched to Sonnet 5 for this session · Fable 5 requires usage credits · /model to change

<img width="950" height="710" alt="Image" src="https://github.com/user-attachments/assets/29df2a2e-9cda-4f62-b175-025852eee071" />