[Bug] Opus 4.5 missing from Claude Code model picker menu

Bug Description
Bug Report: Opus 4.5 Missing from Claude Code Model Picker
Summary
Claude Opus 4.5 does not appear in the /model menu for Max plan subscribers in Claude Code CLI, despite being accessible when specified explicitly.

Environment
Claude Code version: 2.0.37
Subscription: Max plan
Steps to Reproduce
Launch Claude Code CLI with an active Max subscription
Run /model to open the model picker
Observe available options
Expected Behavior
Opus 4.5 should appear as a selectable option in the model picker menu, similar to how it appears in the web and desktop apps.

Actual Behavior
The model picker shows:

1. Default (recommended) Sonnet 4.5 · Smartest model for daily use
2. Opus Legacy: Opus 4.1 · Reaches usage limits faster
3. Haiku Haiku 4.5 · Fastest model for simple tasks

Opus 4.5 is missing. The Opus option still references Opus 4.1 as Legacy.

Workaround
Opus 4.5 IS accessible by specifying the model string directly:

/model claude-opus-4-5-20251101

This succeeds with: Set model to claude-opus-4-5-20251101

Impact
Users may not realize Opus 4.5 is available to them
Inconsistent experience between web/desktop apps (where Opus 4.5 is visible) and CLI
Menu labels are misleading (Opus 4.1 labeled as the Opus option when 4.5 exists)
Suggested Fix
Update the model picker menu to include Opus 4.5 as an option for Max plan subscribers, or replace the Opus 4.1 entry with 4.5.

Environment Info

• Platform: darwin
• Terminal: iTerm.app
• Version: 2.0.37
• Feedback ID: 4a43d50e-7fd1-4ac8-9bb4-5e1ceeb4fc69