diff --git a/litellm/proxy/spend_tracking/spend_tracking_utils.py b/litellm/proxy/spend_tracking/spend_tracking_utils.py
index 6eb4ae54bba..436297d2233 100644
--- a/litellm/proxy/spend_tracking/spend_tracking_utils.py
+++ b/litellm/proxy/spend_tracking/spend_tracking_utils.py
@@ -682,12 +682,8 @@ def _get_session_id_for_spend_log(
     omit_when_missing: bool,
     batch_trace_session_id: str | None = None,
 ) -> str | None:
-    """Under `omit` only `metadata.session_id`, the key Langfuse reads, counts as a session. Batch call types
-    carry a deterministic session derived from the batch id, which outranks everything else because the
-    per-request trace ids differ between the create call and the cost poller's row. Otherwise the caller's
-    `litellm_session_id` wins: it is only absent or a copy of the trace id when the caller did not send one,
-    so preferring it changes nothing for sessionless requests while letting a real session id reach the
-    spend log instead of being overwritten by the per-call trace id."""
+    """Resolve the session id for the spend log row: `omit` honors only metadata.session_id,
+    batch sessions outrank everything, then the caller's litellm_session_id, then trace ids."""
     if omit_when_missing:
         session_id: Final = metadata.get("session_id") if metadata else None
         return str(session_id) if session_id else None
@@ -697,7 +693,7 @@ def _get_session_id_for_spend_log(
     if batch_trace_session_id is not None:
         return batch_trace_session_id
     caller_session_id: Final = kwargs.get("litellm_session_id")
-    if caller_session_id is not None:
+    if caller_session_id:
         return str(caller_session_id)
     if standard_logging_payload is not None and standard_logging_payload.get("trace_id") is not None:
         return str(standard_logging_payload.get("trace_id"))
diff --git a/tests/test_litellm/proxy/spend_tracking/test_spend_tracking_utils.py b/tests/test_litellm/proxy/spend_tracking/test_spend_tracking_utils.py
index 579ddf6cc28..aa63404ea08 100644
--- a/tests/test_litellm/proxy/spend_tracking/test_spend_tracking_utils.py
+++ b/tests/test_litellm/proxy/spend_tracking/test_spend_tracking_utils.py
@@ -234,8 +234,7 @@ def test_batch_session_outranks_the_per_request_trace_id():
 
 
 def test_caller_litellm_session_id_wins_over_the_per_request_trace_id():
-    """A caller-supplied litellm_session_id is a real session, not a copied trace id; the
-    spend log must keep it instead of overwriting it with the per-call trace id."""
+    """Caller litellm_session_id wins over the per-call trace id."""
     session_id: Final = _get_session_id_for_spend_log(
         kwargs={"litellm_session_id": "sess-1", "litellm_trace_id": "trace-abc"},
         metadata={"trace_id": "trace-abc"},
@@ -246,8 +245,7 @@ def test_caller_litellm_session_id_wins_over_the_per_request_trace_id():
 
 
 def test_batch_session_outranks_a_caller_litellm_session_id():
-    """The batch lifecycle grouping must survive even when the create call carries a
-    caller session id, or the poller's cost row would land in a different session."""
+    """Batch session still outranks a caller session id."""
     session_id: Final = _get_session_id_for_spend_log(
         kwargs={"litellm_session_id": "sess-1", "litellm_trace_id": "trace-abc"},
         metadata={"trace_id": "trace-abc"},