diff --git a/cosmos/listeners/task_instance_listener.py b/cosmos/listeners/task_instance_listener.py
index 0a64c3a61a..75381e81cd 100644
--- a/cosmos/listeners/task_instance_listener.py
+++ b/cosmos/listeners/task_instance_listener.py
@@ -119,7 +119,8 @@ def _build_task_metrics(task_instance: TaskInstance, status: str) -> dict[str, o
         "is_cosmos_operator_subclass": _is_cosmos_subclass(task_instance),
         "invocation_mode": _invocation_mode(task_instance),
         "execution_mode": _execution_mode_from_task(task_instance),
-        "map_index": task_instance.map_index,
+        # map_index is -1 for non-mapped tasks, >= 0 for mapped tasks
+        "is_mapped_task": task_instance.map_index >= 0,
     }
 
     dbt_command = _dbt_command(task_instance)
diff --git a/tests/listeners/test_task_instance_listener.py b/tests/listeners/test_task_instance_listener.py
index bbf6de6184..3f052837eb 100644
--- a/tests/listeners/test_task_instance_listener.py
+++ b/tests/listeners/test_task_instance_listener.py
@@ -94,9 +94,19 @@ def test_build_task_metrics_records_core_fields():
     assert metrics["invocation_mode"] == InvocationMode.DBT_RUNNER.value
     assert metrics["execution_mode"] == "local"
     assert metrics["is_cosmos_operator_subclass"] is False
+    assert metrics["is_mapped_task"] is False
     assert metrics["dag_run_id"] == "run-1"
 
 
+def test_build_task_metrics_detects_mapped_task():
+    operator = DummyDbtOperator()
+    ti = _make_task_instance(operator, map_index=2)
+
+    metrics = task_instance_listener._build_task_metrics(ti, status="success")
+
+    assert metrics["is_mapped_task"] is True
+
+
 def test_build_task_metrics_ignores_missing_install_deps():
     operator = DummyDbtOperatorNoDeps()
     ti = _make_task_instance(operator)