sonnet[1m] not available on Max subscription despite docs not restricting it

Bug

/model sonnet[1m] returns:

Sonnet 4.6 with 1M context is not available for your account.

Expected behavior

The model configuration docs only mention Opus 4.6 1M as restricted for subscription users:

"Pro, Max, Teams, and Enterprise subscription users do not have access to Opus 4.6 1M context at launch."

No such restriction is documented for Sonnet 1M. The sonnet[1m] alias is listed as a normal available model alias in the docs table.

Environment

• Account: Max subscription
• Claude Code: v2.1.45
• OS: macOS (Darwin 25.3.0)

Steps to reproduce

1. Have a Max subscription
2. Run /model sonnet[1m]
3. Error: "Sonnet 4.6 with 1M context is not available for your account"

Question

Is this intentional? If so, the docs should be updated to reflect that Sonnet 1M is also restricted for subscription users.