I got a notification when I opened it, indicating that the default had changed, and I can see it on /model.

Only on a max (20x) account, not there on a Pro one.

I'm curious, what does it say on /model?

For reference, my options are:

    ╭─────────────────────────────────────────────────────────────────────────────────────────────╮
    │                                                                                             │
    │  Select Model                                                                               │
    │  Switch between Claude models. Applies to this session and future Claude Code sessions.     │
    │  For custom model names, specify with --model.                                              │
    │                                                                                             │
    │     1. Default (recommended)  Opus 4.1 for up to 50% of usage limits, then use Sonnet 4     │
    │     2. Opus                   Opus 4.1 for complex tasks · Reaches usage limits faster      │
    │     3. Sonnet                 Sonnet 4 for daily use                                        │
    │     4. Opus Plan Mode         Use Opus 4.1 in plan mode, Sonnet 4 otherwise                 │
    │                                                                                             │
    ╰─────────────────────────────────────────────────────────────────────────────────────────────╯

thanks, FYI I'm on a max 20x also and I don't see it!