{"version":"2.1.275","anchor":"offlinefallback-model-catalog-switches-ccrccd-default-mode","canonical_anchor":"offlinefallback-model-catalog-switches-ccrccd-default-mode","heading":"Offline\/fallback model catalog switches ccr\/ccd default model from Sonnet 4.6 to claude-opus-5","tier":"notice","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.275\/e\/offlinefallback-model-catalog-switches-ccrccd-default-mode","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.275","markdown":"### Offline\/fallback model catalog switches ccr\/ccd default model from Sonnet 4.6 to claude-opus-5\n\nFallback model list now defaults 'ccr' and 'ccd' to claude-opus-5 instead of Sonnet 4.6 when the live catalog is unreachable\n\n**What**\n\nClaude Code ships a signed, static backup list of models to use if it can't fetch the live model catalog. In this release, the default model for two of the listed surfaces, 'ccr' and 'ccd', changed from `claude-sonnet-4-6` to `claude-opus-5`. The 'cc' surface entry was already set to `claude-opus-5` and is unchanged.\n\n**Why**\n\nIf Claude Code ever falls back to this offline catalog, users on the 'ccr' and 'ccd' surfaces will now get `claude-opus-5` by default instead of `claude-sonnet-4-6`.\n\n- Area: Models\n- Names: `claude-opus-5`\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 2\/5"}