diff --git a/litellm/responses/utils.py b/litellm/responses/utils.py
index a92b5d25a37..7667d1bad84 100644
--- a/litellm/responses/utils.py
+++ b/litellm/responses/utils.py
@@ -443,11 +443,18 @@ class ResponseAPILoggingUtils:
                 completion_tokens=0,
                 total_tokens=0,
             )
-        response_api_usage: ResponseAPIUsage = (
-            ResponseAPIUsage(**usage_input)
-            if isinstance(usage_input, dict)
-            else usage_input
-        )
+        response_api_usage: ResponseAPIUsage
+        if isinstance(usage_input, dict):
+            total_tokens = usage_input.get("total_tokens")
+            if total_tokens is None:
+                input_tokens = usage_input.get("input_tokens")
+                output_tokens = usage_input.get("output_tokens")
+                if input_tokens is not None and output_tokens is not None:
+                    total_tokens = input_tokens + output_tokens
+                    usage_input["total_tokens"] = total_tokens
+            response_api_usage = ResponseAPIUsage(**usage_input)
+        else:
+            response_api_usage = usage_input
         prompt_tokens: int = response_api_usage.input_tokens or 0
         completion_tokens: int = response_api_usage.output_tokens or 0
         prompt_tokens_details: Optional[PromptTokensDetailsWrapper] = None
diff --git a/tests/test_litellm/responses/test_responses_utils.py b/tests/test_litellm/responses/test_responses_utils.py
index 96ac2e2c345..09628cd4a76 100644
--- a/tests/test_litellm/responses/test_responses_utils.py
+++ b/tests/test_litellm/responses/test_responses_utils.py
@@ -203,3 +203,22 @@ class TestResponseAPILoggingUtils:
         assert result.prompt_tokens == 0
         assert result.completion_tokens == 20
         assert result.total_tokens == 20
+
+    def test_transform_response_api_usage_calculates_total_from_input_and_output_tokens_if_available(self):
+        """Test transformation calculates total_tokens when it's None and input / output tokens are present"""
+        # Setup
+        usage = {
+            "input_tokens": 15,
+            "output_tokens": 25,
+            "total_tokens": None,
+        }
+
+        # Execute
+        result = ResponseAPILoggingUtils._transform_response_api_usage_to_chat_usage(
+            usage
+        )
+
+        # Assert
+        assert result.prompt_tokens == 15
+        assert result.completion_tokens == 25
+        assert result.total_tokens == 40  # 15 + 25