[BUG] Opus 4.8 missing from /model interactive picker, but works when set explicitly

Environment

• Claude Code version: 2.1.198
• Platform: macOS (Darwin 25.5.0)
• Terminal: interactive CLI session

Description

When opening the interactive model selector with /model, Opus 4.8 does not appear as an option. The picker only lists:

Select model
Switch between Claude models. Your pick becomes the default for new sessions. For other/previous model names, specify with --model.

  1. Default (recommended)  Sonnet 5 · Org default
  2. Sonnet                 Sonnet 5 · Efficient for routine tasks · Org default
❯ 3. Fable ✓               Fable 5 · Most capable for your hardest and longest-running tasks
  4. Haiku                  Haiku 4.5 · Fastest for quick answers

However, the model itself is available to my account: setting it explicitly with /model Opus 4.8 works fine and the session runs on Opus 4.8 without issue.

Steps to reproduce

1. Run claude and type /model to open the interactive picker.
2. Observe the list of models — Opus 4.8 is not listed (only Default/Sonnet 5, Sonnet, Fable, Haiku).
3. Type /model claude-opus-4-8 instead — the model is accepted and works.

Expected behavior

Opus 4.8 should appear in the /model interactive picker, since it is a currently available model that the account can use.

Actual behavior

Opus 4.8 is absent from the picker list, so it can only be selected by typing the model name manually.