{"version":"2.1.280","anchor":"opus-renamed-to-opus-55-as-the-latest-per-family-model","canonical_anchor":"opus-renamed-to-opus-55-as-the-latest-per-family-model","heading":"Opus renamed to Opus 5.5 as the latest-per-family model","tier":"internal","area":"Models","url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280\/e\/opus-renamed-to-opus-55-as-the-latest-per-family-model","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280","markdown":"### Opus renamed to Opus 5.5 as the latest-per-family model\n\nOpus model catalog entry renamed from 'Opus 5' to 'Opus 5.5' as the latest in its family\n\n**What**\n\nThe table Claude Code uses to track the newest model in each family, along with fast-mode and model-switching logic, now points to `claude-opus-5-5` instead of `claude-opus-5` as the latest Opus model.\n\n**Why**\n\nThis means features that automatically pick the newest Opus model, such as fast mode or model switching, will now resolve to Opus 5.5 instead of the previous Opus model.\n\n- Area: Models\n- Tier: Under the hood\n- Useful: 2\/5\n- Signal: 2\/5"}