{"version":"2.0.58","anchor":"background-model-reference-updated","canonical_anchor":"background-model-reference-updated","heading":"Background Model Reference Updated","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.0.58\/e\/background-model-reference-updated","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.0.58","markdown":"### Background Model Reference Updated\n\n**What:** Claude's background information now references Opus 4.5 as the most recent frontier model instead of Sonnet 4.5.\n\n**Details:**\n\n- Affects Claude's self-awareness when discussing model capabilities\n- **Evidence**: `Jy3 = \"Claude Opus 4.5\"` at line 509270 in v2.0.58"}