[BUG] sonnet[1m] appears in model selector on Max plan but is not available - should be hidden

Bug report

The sonnet[1m] and opus[1m] model variants appear in the Claude Code model selector on Max plan, but selecting them returns an API rate limit error.

If 1M context is only available for pay-as-you-go users, the [1m] variants should not appear in the model selector for Max subscribers. Showing an option that cannot be used is misleading.

Steps to reproduce

1. Subscribe to Max plan
2. Open Claude Code
3. Run /model sonnet[1m]
4. Attempt to use it — hits API rate limit

Expected behavior

Either:

• Option A: Enable 1M context for Max plan subscribers (preferred — Max is the highest consumer tier)
• Option B: Hide [1m] model variants from the selector when on a plan that doesn't support it

Environment

• Plan: Max
• OS: Windows 11
• Claude Code: latest

Related issues

#15057, #10219, #23822, #23472 — all reporting the same frustration across Max 5x and 20x plans.