curl --request GET \
  --url https://api.mixpeek.com/v1/retrievers/benchmarks/{benchmark_id} \
  --header 'Authorization: Bearer <token>'

{
  "benchmark_id": "<string>",
  "benchmark_name": "<string>",
  "baseline_retriever_id": "<string>",
  "candidate_retriever_ids": [
    "<string>"
  ],
  "session_count": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "session_filter": {
    "retriever_ids": [
      "<string>"
    ],
    "taxonomy_node_ids": [
      "<string>"
    ],
    "time_range": {
      "start": "2023-11-07T05:31:56Z",
      "end": "2023-11-07T05:31:56Z"
    },
    "min_interactions": 1,
    "interaction_types": [
      "<string>"
    ],
    "sample_strategy": "random",
    "interaction_weights": {
      "weights": {}
    }
  },
  "results": [
    {
      "retriever_id": "<string>",
      "retriever_name": "<string>",
      "pipeline_hash": "<string>",
      "metrics": {
        "ndcg_at_k": {},
        "mean_rank_clicked": 123,
        "recall_at_k": {},
        "avg_position_delta": 123,
        "items_promoted": 1,
        "items_demoted": 1,
        "sessions_improved": 1,
        "sessions_degraded": 1,
        "sessions_neutral": 1,
        "mean_rank_purchased": 123
      },
      "latency": {
        "p50_ms": 1,
        "p90_ms": 1,
        "p99_ms": 1,
        "mean_ms": 1,
        "stage_latencies": {}
      },
      "failed_sessions": 1,
      "taxonomy_deltas": {},
      "error_summary": {}
    }
  ],
  "comparison": {
    "baseline_retriever_id": "<string>",
    "comparisons": [
      {
        "candidate_retriever_id": "<string>",
        "ndcg_delta": {},
        "recall_delta": {},
        "latency_delta_ms": 123,
        "p_value": 123,
        "confidence_interval": {
          "[0]": 123,
          "[1]": 123
        },
        "taxonomy_wins": [
          "<string>"
        ],
        "taxonomy_losses": [
          "<string>"
        ]
      }
    ],
    "recommendation": "<string>"
  },
  "started_at": "2023-11-07T05:31:56Z",
  "completed_at": "2023-11-07T05:31:56Z",
  "error_message": "<string>"
}