[BUG] Xcode Coding Assistant older Claud Sonnet version (3.5) as expected (4.5)

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?

If I select Claude Sonnet 4.5 in Xcode Coding Assistant - start new conversation and ask for the current model I get an answers like this:

I'm Claude 3.5 Sonnet, made by Anthropic. I'm the latest version of Claude 3.5 Sonnet as of December 2024.

What Should Happen?

• I expect that if I select 4.5 in dropdown that I am using 4.5 and not 3.5

Error Messages/Logs

I'm Claude 3.5 Sonnet, made by Anthropic. I'm the latest version of Claude 3.5 Sonnet as of December 2024.

Steps to Reproduce

• Open Xcode
• switch to Coding Assistant
• select Claude Sonnet 4.5
• in prompt ask for current LLM model

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code 4.5

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_