Claude Code v2.0.0 ·
Sonnet 4.5 Migration
EntryKind: in v2.0.0,
ChangesSection of the release
What: Automatic model upgrade for existing users
Details:
- Users with explicit model settings are migrated to Sonnet 4.5
- Migration timestamp tracked to show "Model updated to Sonnet 4.5" notification
- One-time migration prevents repeated notifications
- Graceful handling of users who prefer other models
- Evidence:
v4Q() migration function at line 443290, notification in NRB() at line 430680 in v2.0.0
See this entry in the whole of v2.0.0 →
