{"version":"2.0.0","anchor":"sonnet-4-5-migration","canonical_anchor":"sonnet-4-5-migration","heading":"Sonnet 4.5 Migration","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.0.0\/e\/sonnet-4-5-migration","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.0.0","markdown":"### Sonnet 4.5 Migration\n\n**What:** Automatic model upgrade for existing users\n\n**Details:**\n\n- Users with explicit model settings are migrated to Sonnet 4.5\n- Migration timestamp tracked to show \"Model updated to Sonnet 4.5\" notification\n- One-time migration prevents repeated notifications\n- Graceful handling of users who prefer other models\n- **Evidence**: `v4Q()` migration function at line 443290, notification in `NRB()` at line 430680 in v2.0.0"}