curl --request GET \
  --url http://localhost:8080/v1/batches/{batch_id}

{
  "id": "<string>",
  "object": "<string>",
  "endpoint": "<string>",
  "input_file_id": "<string>",
  "completion_window": "<string>",
  "status": "validating",
  "request_counts": {
    "total": 123,
    "completed": 123,
    "failed": 123,
    "succeeded": 123,
    "expired": 123,
    "canceled": 123,
    "pending": 123
  },
  "metadata": {},
  "created_at": 123,
  "expires_at": 123,
  "in_progress_at": 123,
  "finalizing_at": 123,
  "completed_at": 123,
  "failed_at": 123,
  "expired_at": 123,
  "cancelling_at": 123,
  "cancelled_at": 123,
  "output_file_id": "<string>",
  "error_file_id": "<string>",
  "errors": {
    "object": "<string>",
    "data": [
      {
        "code": "<string>",
        "message": "<string>",
        "param": "<string>",
        "line": 123
      }
    ]
  },
  "processing_status": "<string>",
  "results_url": "<string>",
  "archived_at": 123,
  "operation_name": "<string>",
  "done": true,
  "progress": 123,
  "extra_fields": {
    "request_type": "<string>",
    "provider": "openai",
    "model_requested": "<string>",
    "model_deployment": "<string>",
    "latency": 123,
    "chunk_index": 123,
    "raw_request": {},
    "raw_response": {},
    "cache_debug": {
      "cache_hit": true,
      "cache_id": "<string>",
      "hit_type": "<string>",
      "provider_used": "<string>",
      "model_used": "<string>",
      "input_tokens": 123,
      "threshold": 123,
      "similarity": 123
    }
  }
}