diff --git a/benchmarks/utils/evaluation.py b/benchmarks/utils/evaluation.py
index e2ae1db5..e782f98d 100644
--- a/benchmarks/utils/evaluation.py
+++ b/benchmarks/utils/evaluation.py
@@ -255,15 +255,32 @@ def _run_iterative_mode(
         # Initialize Laminar
         LaminarService.get().initialize()
 
-        # Create Laminar evaluation
+        # Build metadata for Laminar evaluation and traces
+        run_id = os.getenv("UNIQUE_EVAL_NAME")
+        laminar_meta = {
+            k: v
+            for k, v in [
+                ("benchmark", self.metadata.dataset),
+                ("model", self.metadata.llm.model),
+            ]
+            if v
+        }
+
+        # Create Laminar evaluation (use run_id as name if available)
         now = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
+        eval_name = (
+            run_id or f"{self.metadata.dataset} {self.metadata.dataset_split} {now}"
+        )
         self.metadata.lmnr = LaminarEvalMetadata(
             eval_id=LaminarService.get().create_evaluation(
-                name=f"{self.metadata.dataset} {self.metadata.dataset_split} {now}",
+                name=eval_name,
                 group_name=f"{self.metadata.dataset} {self.metadata.dataset_split}",
-                metadata=self.metadata.model_dump(mode="json"),
+                metadata=laminar_meta or None,
             )
         )
+        # Store for use in datapoint creation
+        self._laminar_session_id = run_id
+        self._laminar_trace_meta = laminar_meta or None
 
         total_instances = len(all_instances)
         logger.info("prepared %d instances for evaluation", total_instances)
@@ -333,6 +350,8 @@ def attempt_on_result(instance: EvalInstance, out: EvalOutput) -> None:
                             inst.id,
                             self.metadata.model_dump(mode="json"),
                             index,
+                            session_id=self._laminar_session_id,
+                            trace_metadata=self._laminar_trace_meta,
                         )
                     )
                     if datapoint_id is not None:
diff --git a/benchmarks/utils/laminar.py b/benchmarks/utils/laminar.py
index 24b91ed2..92141819 100644
--- a/benchmarks/utils/laminar.py
+++ b/benchmarks/utils/laminar.py
@@ -79,26 +79,23 @@ def _get_client(self) -> LaminarClient | None:
         return self._client
 
     def create_evaluation(
-        self, name: str, group_name: str, metadata: dict[str, Any] | None = None
+        self,
+        name: str,
+        group_name: str,
+        metadata: dict[str, Any] | None = None,
     ):
         client = self._get_client()
         if client is None:
             return None
 
         try:
-            eval_id = client.evals.create_evaluation(
+            return client.evals.create_evaluation(
                 name=name,
                 group_name=group_name,
                 metadata=metadata,
             )
-            return eval_id
         except Exception as exc:  # pragma: no cover - defensive logging
-            logger.debug(
-                "Laminar evaluation %s (%s): %s",
-                name,
-                group_name,
-                exc,
-            )
+            logger.debug("Laminar evaluation %s (%s): %s", name, group_name, exc)
 
     def create_evaluation_datapoint(
         self,
@@ -106,10 +103,13 @@ def create_evaluation_datapoint(
         data: Any,
         metadata: dict[str, Any],
         index: int,
+        session_id: str | None = None,
+        trace_metadata: dict[str, Any] | None = None,
     ) -> tuple[UUID | None, str | None]:
         """
         Create a Laminar datapoint.
         Creates a new span for the evaluation and returns the span context.
+        Session ID and trace metadata are set on the span if provided.
         """
 
         if eval_id is None:
@@ -124,6 +124,12 @@ def create_evaluation_datapoint(
                 "Evaluation",
                 span_type="EVALUATION",  # type: ignore
             )
+            # Set session ID and metadata on the active span
+            if session_id:
+                Laminar.set_trace_session_id(session_id)
+            if trace_metadata:
+                Laminar.set_trace_metadata(trace_metadata)
+
             lmnr_span_ctx = Laminar.serialize_span_context(eval_span)
             eval_span.end()