{"version":"2.1.280","anchor":"mid-conversation-system-opt-out-model-list-simplified-to-a-v","canonical_anchor":"mid-conversation-system-opt-out-model-list-simplified-to-a-v","heading":"mid_conversation_system opt-out model list simplified to a version comparator","tier":"internal","area":"Models","url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280\/e\/mid-conversation-system-opt-out-model-list-simplified-to-a-v","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.280","markdown":"### mid_conversation_system opt-out model list simplified to a version comparator\n\nMid-conversation system prompt opt-out now uses a version comparison instead of a fixed model-name list\n\n**What**\n\nThe check that decides whether the mid-conversation system prompt beta applies to a given model no longer lists out individual model names one by one (previously including names like `claude-opus-4-0`, `-4-1`, `-4-5`, `-4-6`, `-4-7`, and the corresponding Sonnet and Haiku 4.x names). It now does a single version comparison against `claude-opus-4-8`.\n\n**Why**\n\nSwitching to a version comparison means new model versions on this side of the comparison are handled automatically, rather than needing each new model name added to a hardcoded list.\n\n- Area: Models\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5"}