{
  "model_name": "Claude Opus 4.5",
  "model_organization": "Anthropic",
  "submitting_organization": "Sierra",
  "submission_date": "2026-02-26",
  "contact_info": {
    "email": "victor@sierra.ai, ben.s@sierra.ai",
    "name": "Sierra Research Team"
  },
  "is_new": false,
  "submission_type": "standard",
  "trajectories_available": true,
  "trajectory_files": {
    "airline": "claude-opus-4-5_high_airline_gpt-5.2_4trials.json",
    "retail": "claude-opus-4-5_high_retail_gpt-5.2_4trials.json",
    "telecom": "claude-opus-4-5_high_telecom_gpt-5.2_4trials.json",
    "banking_knowledge": "claude-opus-4-5_high_banking_knowledge_gpt-5.2_4trials.json"
  },
  "references": [],
  "results": {
    "airline": {
      "pass_1": 84.0,
      "pass_2": 77.67,
      "pass_3": 73.5,
      "pass_4": 70.0,
      "cost": 0.39919
    },
    "retail": {
      "pass_1": 79.61,
      "pass_2": 67.4,
      "pass_3": 58.77,
      "pass_4": 51.75,
      "cost": 0.38695
    },
    "telecom": {
      "pass_1": 92.32,
      "pass_2": 86.11,
      "pass_3": 81.36,
      "pass_4": 78.07,
      "cost": 0.71992
    },
    "banking_knowledge": {
      "pass_1": 21.39,
      "pass_2": 13.4,
      "pass_3": 10.31,
      "pass_4": 8.25,
      "cost": null,
      "retrieval_config": "alltools"
    }
  },
  "reasoning_effort": "high",
  "methodology": {
    "evaluation_date": "2026-05-05",
    "tau2_bench_version": "0.2.1-dev",
    "user_simulator": "gpt-5.2",
    "notes": "Evaluated using AllTools retrieval (BM25 + dense OpenAI text-embedding-3-large + sandboxed shell). User simulator: gpt-5.2 with reasoning_effort: low. 4 trials. Seed: 300. Banking_knowledge domain only — other domains intentionally excluded from this comparison; the AllTools setting standardizes retrieval across models.",
    "verification": {
      "modified_prompts": false,
      "omitted_questions": false,
      "details": "Verified evaluation with full trajectory data available. Standard tau-bench scaffold."
    }
  },
  "model_release": {
    "release_date": "2025-11-24",
    "announcement_url": "https://www.anthropic.com/news/claude-opus-4-5",
    "announcement_title": "Introducing Claude Opus 4.5"
  }
}