[BUG] Default model UI shows "Opus 4.5" but loads Opus 4.1

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?

When selecting "Default (Opus 4.5 · Most capable for complex work)" from /model,
Claude Code loads claude-opus-4-1-20250805 instead of claude-opus-4-5-20251101.

The /context command confirms the wrong model is loaded.

What Should Happen?

Selecting "Default (Opus 4.5)" should load claude-opus-4-5-20251101

Error Messages/Logs

/context output shows:
  claude-opus-4-1-20250805 · 74k/200k tokens (37%)

  Expected:
  claude-opus-4-5-20251101

Steps to Reproduce

1. Start Claude Code
2. Run /model
3. Select "Default (Opus 4.5 · Most capable for complex work)"
4. Run /context
5. Observe model ID shows claude-opus-4-1-20250805 not claude-opus-4-5-20251101

Workaround: Manually selecting claude-opus-4-5-20251101 works correctly.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.56 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

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