[
  {
    "id": "invoice-01",
    "group": "Extraction",
    "passed": true,
    "latency_ms": 750,
    "cost_microusd": 1500
  },
  {
    "id": "invoice-02",
    "group": "Extraction",
    "passed": true,
    "latency_ms": 1100,
    "cost_microusd": 2500
  },
  {
    "id": "lookup-01",
    "group": "Tool use",
    "passed": false,
    "latency_ms": 800,
    "cost_microusd": 2000
  },
  {
    "id": "lookup-02",
    "group": "Tool use",
    "passed": false,
    "latency_ms": 2400,
    "cost_microusd": 4000
  }
]