[BUG] Fable 5 requires API credits before metering on Jul 19

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)
• [ ] I am using the latest version of Claude Code

What's Wrong?

When I create a new session of CC and set the model to Fable 5, I'm getting requests to fill up my credit usage. The Fable metering starts on July 19th, so it doesn't make sense for it to be requesting API credits today (July 17th)?

What Should Happen?

Claude should automatically accept any requests that use Fable 5.

Error Messages/Logs

Usage credits are required for this model.

✻ Worked for 0s

❯ /model
  ⎿  Set model to Fable 5 and saved as your default for new sessions

❯ /effort
  ⎿  Set effort level to medium (saved as your default for new sessions): Balanced approach with standard implementation and testing

❯ abc123

Usage credits are required for this model.

Steps to Reproduce

Create a new Claude Code session in Terminal.app (via "claude"), use /model to switch from your default model to Fable 5 (assuming it's not already set to Fable 5), and make a request. Changing effort does not seem to fix the issue.

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.195 (older)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Ensure your session is new.