What
Users on older Opus 4.x models (Opus 4.0, 4.1) now see a notification suggesting they upgrade to Opus 4.5.
Details
- Only shows for first-party users (claude.ai)
- Displays: "Opus 4.5 is available and is our best model for coding"
- Includes a hint to use
/modelcommand to upgrade - Nudge appears for ~10 seconds then dismisses
Evidence
vN9() at line 535826 (opus upgrade nudge, contains "opus-45-upgrade-nudge", "Opus 4.5 is available and is our best model for coding")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.