{"version":"2.1.219","anchor":"opus-5-wired-through-region-env-vars-refusal-fallbacks-and-p","canonical_anchor":"opus-5-wired-through-region-env-vars-refusal-fallbacks-and-p","heading":"Opus 5 wired through region env vars, refusal fallbacks and pricing copy","tier":"notice","area":"Models","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.219\/e\/opus-5-wired-through-region-env-vars-refusal-fallbacks-and-p","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.219","markdown":"### Opus 5 wired through region env vars, refusal fallbacks and pricing copy\n\nAn Opus 5 model is wired through region variables, fast mode, 1M context and pricing text.\n\n**What**\n\nSupporting plumbing for a new Opus 5 model lands across region selection, effort\/speed handling, context eligibility and billing copy.\n\n**Details**\n\n- `VERTEX_REGION_CLAUDE_5_OPUS` joins the recognized Vertex region environment variables.\n- The effort\/speed table treats `claude-opus-5` like `claude-opus-4-8` for fast mode.\n- 1M-context eligibility now matches on `claude-opus-5`, and the internal model-family list gains `\"opus5\"` ahead of `\"opus48\"`.\n- The upsell\/pricing copy branch keys on `claude-opus-5` instead of `claude-opus-4-8`.\n- The system-prompt blurb drops Opus 4.8 and now reads \"The most recent Claude models are the Claude 5 family and Haiku 4.5.\"\n- Some Mythos-era strings were deleted, including one reading \"This model's safeguards flagged this message. This sometimes happens with safe, normal conversations.\"\n\n**Evidence**\n\n`VERTEX_REGION_CLAUDE_5_OPUS`\n\n- Area: Models\n- Names: `VERTEX_REGION_CLAUDE_5_OPUS`\n- Tier: You'll notice\n- Useful: 3\/5\n- Signal: 0\/5"}