diff --git a/libs/labelbox/src/labelbox/schema/model_run.py b/libs/labelbox/src/labelbox/schema/model_run.py
index a7712858e..0791e15e5 100644
--- a/libs/labelbox/src/labelbox/schema/model_run.py
+++ b/libs/labelbox/src/labelbox/schema/model_run.py
@@ -16,6 +16,8 @@
     Union,
 )
 
+from lbox.exceptions import InternalServerError, ResourceNotFoundError
+
 from labelbox.orm.db_object import DbObject, experimental
 from labelbox.orm.model import Entity, Field, Relationship
 from labelbox.orm.query import results_query_part
@@ -65,6 +67,53 @@ class Status(Enum):
         COMPLETE = "COMPLETE"
         FAILED = "FAILED"
 
+    def _get_cost_and_usage(self) -> Dict[str, Any]:
+        """Lazily fetches and caches cost and data row count for this Model Run.
+
+        Returns an empty dict when no cost/usage information is available.
+        """
+        if getattr(self, "_cost_and_usage", None) is None:
+            query_str = """
+                query GetModelRunCostInfoPyApi($modelRunId: ID!) {
+                    modelFoundryModelRunInfo(where: {modelRunId: $modelRunId}) {
+                        cost
+                        status
+                        totalDataRows
+                    }
+                }
+            """
+            try:
+                res = self.client.execute(query_str, {"modelRunId": self.uid})
+            except (ResourceNotFoundError, InternalServerError):
+                # No cost/usage info available; cache the empty result.
+                # Transient errors (network, timeout, rate limit) are not
+                # caught so they propagate and the next access can retry.
+                res = None
+            self._cost_and_usage = (res or {}).get(
+                "modelFoundryModelRunInfo"
+            ) or {}
+        return self._cost_and_usage
+
+    @property
+    def total_cost(self) -> Optional[float]:
+        """Total cost (USD) of this Model Run.
+
+        ``None`` if cost is not available for this run.
+        """
+        return self._get_cost_and_usage().get("cost")
+
+    @property
+    def total_data_rows(self) -> Optional[int]:
+        """Number of data rows processed by this Model Run.
+
+        ``None`` if not available for this run.
+        """
+        return self._get_cost_and_usage().get("totalDataRows")
+
+    def refresh_cost_and_usage(self) -> None:
+        """Clears the cached cost/usage so the next access re-fetches live data."""
+        self._cost_and_usage = None
+
     def upsert_labels(
         self,
         label_ids: Optional[List[str]] = None,
diff --git a/libs/labelbox/tests/unit/test_unit_model_run.py b/libs/labelbox/tests/unit/test_unit_model_run.py
new file mode 100644
index 000000000..747f1aa00
--- /dev/null
+++ b/libs/labelbox/tests/unit/test_unit_model_run.py
@@ -0,0 +1,116 @@
+from unittest.mock import MagicMock
+
+import pytest
+from lbox.exceptions import (
+    InternalServerError,
+    NetworkError,
+    ResourceNotFoundError,
+)
+
+from labelbox.schema.model_run import ModelRun
+
+
+def _make_model_run(client):
+    return ModelRun(
+        client,
+        {
+            "id": "model-run-1",
+            "name": "test run",
+            "createdAt": "2021-06-01T00:00:00.000Z",
+            "updatedAt": "2021-06-01T00:00:00.000Z",
+            "createdBy": "user-1",
+            "modelId": "model-1",
+            "trainingMetadata": {},
+            "modelAppId": "app-1",
+        },
+    )
+
+
+def test_total_cost_and_data_rows_are_fetched_and_cached():
+    client = MagicMock()
+    client.execute.return_value = {
+        "modelFoundryModelRunInfo": {
+            "cost": 3.5,
+            "status": "finished",
+            "totalDataRows": 12,
+        }
+    }
+    model_run = _make_model_run(client)
+
+    assert model_run.total_cost == 3.5
+    assert model_run.total_data_rows == 12
+
+    # Cost/usage is rehydrated once and cached across property reads.
+    assert client.execute.call_count == 1
+    # The model run id is passed to the query.
+    assert client.execute.call_args[0][1] == {"modelRunId": "model-run-1"}
+
+
+def test_refresh_cost_and_usage_refetches():
+    client = MagicMock()
+    client.execute.return_value = {
+        "modelFoundryModelRunInfo": {
+            "cost": 1.0,
+            "status": "finished",
+            "totalDataRows": 1,
+        }
+    }
+    model_run = _make_model_run(client)
+
+    assert model_run.total_cost == 1.0
+    model_run.refresh_cost_and_usage()
+    assert model_run.total_cost == 1.0
+    assert client.execute.call_count == 2
+
+
+@pytest.mark.parametrize(
+    "error",
+    [
+        ResourceNotFoundError(message="model run not found"),
+        InternalServerError("no model job for run"),
+    ],
+)
+def test_cost_and_usage_none_for_non_foundry_run(error):
+    client = MagicMock()
+    client.execute.side_effect = error
+    model_run = _make_model_run(client)
+
+    assert model_run.total_cost is None
+    assert model_run.total_data_rows is None
+
+
+@pytest.mark.parametrize(
+    "execute_result",
+    [
+        None,  # execute() can return None instead of a payload
+        {"modelFoundryModelRunInfo": None},
+    ],
+)
+def test_cost_and_usage_none_when_payload_missing(execute_result):
+    client = MagicMock()
+    client.execute.return_value = execute_result
+    model_run = _make_model_run(client)
+
+    assert model_run.total_cost is None
+    assert model_run.total_data_rows is None
+
+
+def test_transient_errors_propagate_and_are_not_cached():
+    client = MagicMock()
+    client.execute.side_effect = NetworkError(Exception("boom"))
+    model_run = _make_model_run(client)
+
+    with pytest.raises(NetworkError):
+        _ = model_run.total_cost
+
+    # The failure is not cached, so a later successful access recovers.
+    client.execute.side_effect = None
+    client.execute.return_value = {
+        "modelFoundryModelRunInfo": {
+            "cost": 2.0,
+            "status": "finished",
+            "totalDataRows": 5,
+        }
+    }
+    assert model_run.total_cost == 2.0
+    assert model_run.total_data_rows == 5