[BUG] model switches silently to sonnet 4.6 from opus 4.8 1M after context compaction in Claude Code VS Code Assistant

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?

model switches silently to sonnet 4.6 from opus 4.8 1M after context compaction in Claude Code VS Code Assistant

What Should Happen?

model switches silently to sonnet 4.6 from opus 4.8 1M after context compaction in Claude Code VS Code Assistant

Error Messages/Logs

Steps to Reproduce

select opus 4.8 1M in new VS Code Claude Code session, work until auto-compaction occurs, check current model

Claude Model

_No response_

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.191

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_