[Bug] Unintended model downgrade from FABLE 5 to Opus 4.8

**Bug Description**
Completely unnecessary downgrade from fable five to opus 4.8.

**Environment Info**
- Platform: darwin
- Terminal: vscode
- Version: 2.1.216
- Feedback ID: fb145969-4a51-49d0-84fc-4a2210b91988

**Errors**
```json
[]
```
