{"version":"2.1.207","anchor":"default-model-upgraded-to-claude-opus-4-8","canonical_anchor":"default-model-upgraded-to-claude-opus-4-8","heading":"Default Model Upgraded to Claude Opus 4.8","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.207\/e\/default-model-upgraded-to-claude-opus-4-8","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.207","markdown":"### Default Model Upgraded to Claude Opus 4.8\n\nThe model constant has changed from `opus47` to `opus48` (`claude-opus-4-8`). This applies to the primary model slot across all providers.\n\nAdditionally, for Bedrock and Vertex sessions where only `ANTHROPIC_DEFAULT_SONNET_MODEL` has been customized (but not `ANTHROPIC_DEFAULT_OPUS_MODEL`), the system now intelligently falls back to Sonnet as the main model rather than forcing Opus \u2014 better matching admin intent when they configured only one model.\n\n**Evidence**\n\nModel constant `opus48` added (search for `\"opus48\"`) and provider-aware model selection (search for `\"CLAUDE_CODE_3P_PROBE_WROTE_SONNET_DEFAULT\"`)"}