[BUG] Wrong default subagent model

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?

On a Max plan (Team account) the default model for subagents is set to Sonnet rather than Opus. The default model for the main agent is correctly set to Opus though.

What Should Happen?

Subagents should default to Opus when not explicitly setting a model.

Error Messages/Logs

Steps to Reproduce

1. Create a subagent without specifying a model.
2. Open Claude Code and look at agents with /agents which will show to model used for each agent.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.62

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_