diff --git a/litellm/litellm_core_utils/litellm_logging.py b/litellm/litellm_core_utils/litellm_logging.py
index c4fafc6ee31..914b0d6888e 100644
--- a/litellm/litellm_core_utils/litellm_logging.py
+++ b/litellm/litellm_core_utils/litellm_logging.py
@@ -3888,7 +3888,7 @@ class Logging(LiteLLMLoggingBaseClass):
             return LiteLLMResponsesTransformationHandler().transform_response(
                 model=self.model,
                 raw_response=result,
-                model_response=litellm.ModelResponse(),
+                model_response=litellm.ModelResponse(id=_provider_response_id(result)),
                 logging_obj=self,
                 request_data={},
                 messages=[],
@@ -3903,7 +3903,7 @@ class Logging(LiteLLMLoggingBaseClass):
                 "usage-only ModelResponse to keep the spend_logs row.",
                 str(e),
             )
-            model_response: Final = litellm.ModelResponse()
+            model_response: Final = litellm.ModelResponse(id=_provider_response_id(result))
             model_response.model = self.model
             usage: Final = getattr(result, "usage", None)
             if usage is not None and ResponseAPILoggingUtils._is_response_api_usage(usage):
diff --git a/tests/pass_through_tests/test_anthropic_passthrough.py b/tests/pass_through_tests/test_anthropic_passthrough.py
index b4bcd62feb3..0452b171f9e 100644
--- a/tests/pass_through_tests/test_anthropic_passthrough.py
+++ b/tests/pass_through_tests/test_anthropic_passthrough.py
@@ -84,18 +84,16 @@ async def test_anthropic_basic_completion_with_headers():
                             print("Waiting 10 seconds before retry...")
                             await asyncio.sleep(10)
 
-            # Spend data might be unavailable (auth error, slow DB write, etc.)
-            if (
-                spend_data is None
-                or not isinstance(spend_data, list)
-                or len(spend_data) == 0
-                or not isinstance(spend_data[0], dict)
-                or "request_id" not in spend_data[0]
-            ):
-                print(f"Spend data not available or is error response: {spend_data}")
-                print("Skipping spend assertions (DB write may be slow in CI)")
+            if not isinstance(spend_data, list):
+                print(f"Spend endpoint answered with an error response: {spend_data}")
+                print("Skipping spend assertions (spend logs unreachable in CI)")
                 return
 
+            assert spend_data, (
+                f"GET /spend/logs?request_id={anthropic_message_id} found no row for the id "
+                "the caller received"
+            )
+
             log_entry = spend_data[0]
 
             # Basic existence checks
@@ -255,18 +253,16 @@ async def test_anthropic_streaming_with_headers():
                             print("Waiting 10 seconds before retry...")
                             await asyncio.sleep(10)
 
-            # Spend data might be unavailable (auth error, slow DB write, etc.)
-            if (
-                spend_data is None
-                or not isinstance(spend_data, list)
-                or len(spend_data) == 0
-                or not isinstance(spend_data[0], dict)
-                or "request_id" not in spend_data[0]
-            ):
-                print(f"Spend data not available or is error response: {spend_data}")
-                print("Skipping spend assertions (DB write may be slow in CI)")
+            if not isinstance(spend_data, list):
+                print(f"Spend endpoint answered with an error response: {spend_data}")
+                print("Skipping spend assertions (spend logs unreachable in CI)")
                 return
 
+            assert spend_data, (
+                f"GET /spend/logs?request_id={anthropic_message_id} found no row for the id "
+                "the caller received"
+            )
+
             log_entry = spend_data[0]
 
             # Basic existence checks
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 97c004eb5ff..c5f1b257715 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
@@ -4186,3 +4186,46 @@ def test_spend_log_request_id_for_chat_completions_is_untouched():
         )
         == "chatcmpl-EJvWIw3DAhuKYuwp3jJI4Pnhp2vjv"
     )
+
+
+def test_spend_log_request_id_is_the_response_id_a_bridged_messages_caller_received():
+    """
+    /v1/messages against a non-Anthropic model answers with the Responses id the caller then
+    looks their row up by, so the row must not fall back to a fresh chatcmpl- uuid.
+    """
+    from litellm.types.llms.openai import ResponseAPIUsage, ResponsesAPIResponse
+
+    logging_obj = _anthropic_messages_logging_obj(stream=False)
+    bridged_response = ResponsesAPIResponse(
+        id="resp_01Lit6806Bridged",
+        object="response",
+        created_at=1767225600,
+        model="gpt-5.6",
+        status="completed",
+        output=[
+            {
+                "id": "msg_bridged_output",
+                "type": "message",
+                "role": "assistant",
+                "status": "completed",
+                "content": [{"type": "output_text", "text": "delta", "annotations": []}],
+            }
+        ],
+        usage=ResponseAPIUsage(input_tokens=13, output_tokens=5, total_tokens=18),
+    )
+
+    logged_response = logging_obj._handle_anthropic_messages_response_logging(result=bridged_response)
+
+    assert logged_response.id == "resp_01Lit6806Bridged"
+    assert (
+        _spend_log_request_id(
+            response_obj=logged_response,
+            kwargs={
+                "call_type": "anthropic_messages",
+                "model": "gpt-5.6",
+                "litellm_call_id": "6806cafe-0000-4000-8000-000000000003",
+                "litellm_params": {"metadata": {"user_api_key": "test-key"}},
+            },
+        )
+        == "resp_01Lit6806Bridged"
+    )