{"version":"2.0.51","anchor":"opus-4-5-model-support","canonical_anchor":"opus-4-5-model-support","heading":"Opus 4.5 Model Support","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.0.51\/e\/opus-4-5-model-support","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.0.51","markdown":"### Opus 4.5 Model Support\n\n**What:** Opus 4.5 is now available as the most capable model for complex work, replacing Opus 4.1 as the default for first-party API users.\n\n**How to use:**\n\n`# Select Opus 4.5 via the model command \/model opus # Or specify directly claude --model opus` **Details:**\n\n- Opus 4.5 becomes the default for Max and Team subscribers using first-party API\n- Bedrock\/Vertex\/Foundry users continue to use Opus 4.1\n- Model descriptions updated: \"Most capable for complex work\"\n- One-time migration automatically resets model selection for eligible users\n- A notification informs users about Opus 4.5 availability on first use\n- **Evidence**: Model registry at `rcA()` line 163104, default logic at `QUA()` line 224121, selector at `rJ6` line 224397"}