[Bug] Validation Missing: Incorrect Model Name Not Caught Before API Call

Bug Description
Able to start claude with the claude --model opu command with a typo in the model name. API error will occur. Should have a warning message or fail to start with the wrong name.

Environment Info

• Platform: darwin
• Terminal: clion
• Version: 1.0.128
• Feedback ID: c6664a79-dbfc-4151-8b98-44659e1f04b6

Errors

 API Error: 404 {"type":"error","error":{"type":"not_found_error","message":"model: 
     op"},"request_id":"req_***"}