diff --git a/tests/litellm/responses/test_responses_utils.py b/tests/litellm/responses/test_responses_utils.py
index ab770552db..3567f609e7 100644
--- a/tests/litellm/responses/test_responses_utils.py
+++ b/tests/litellm/responses/test_responses_utils.py
@@ -14,6 +14,7 @@ from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfi
 from litellm.llms.openai.responses.transformation import OpenAIResponsesAPIConfig
 from litellm.responses.utils import ResponseAPILoggingUtils, ResponsesAPIRequestUtils
 from litellm.types.llms.openai import ResponsesAPIOptionalRequestParams
+from litellm.types.utils import Usage
 
 
 class TestResponsesAPIRequestUtils:
@@ -82,3 +83,68 @@ class TestResponsesAPIRequestUtils:
         assert "model" not in result
         assert result["temperature"] == 0.7
         assert result["max_output_tokens"] == 100
+
+
+class TestResponseAPILoggingUtils:
+    def test_is_response_api_usage_true(self):
+        """Test identification of Response API usage format"""
+        # Setup
+        usage = {"input_tokens": 10, "output_tokens": 20}
+
+        # Execute
+        result = ResponseAPILoggingUtils._is_response_api_usage(usage)
+
+        # Assert
+        assert result is True
+
+    def test_is_response_api_usage_false(self):
+        """Test identification of non-Response API usage format"""
+        # Setup
+        usage = {"prompt_tokens": 10, "completion_tokens": 20, "total_tokens": 30}
+
+        # Execute
+        result = ResponseAPILoggingUtils._is_response_api_usage(usage)
+
+        # Assert
+        assert result is False
+
+    def test_transform_response_api_usage_to_chat_usage(self):
+        """Test transformation from Response API usage to Chat usage format"""
+        # Setup
+        usage = {
+            "input_tokens": 10,
+            "output_tokens": 20,
+            "total_tokens": 30,
+            "output_tokens_details": {"reasoning_tokens": 5},
+        }
+
+        # Execute
+        result = ResponseAPILoggingUtils._transform_response_api_usage_to_chat_usage(
+            usage
+        )
+
+        # Assert
+        assert isinstance(result, Usage)
+        assert result.prompt_tokens == 10
+        assert result.completion_tokens == 20
+        assert result.total_tokens == 30
+
+    def test_transform_response_api_usage_with_none_values(self):
+        """Test transformation handles None values properly"""
+        # Setup
+        usage = {
+            "input_tokens": 0,  # Changed from None to 0
+            "output_tokens": 20,
+            "total_tokens": 20,
+            "output_tokens_details": {"reasoning_tokens": 5},
+        }
+
+        # Execute
+        result = ResponseAPILoggingUtils._transform_response_api_usage_to_chat_usage(
+            usage
+        )
+
+        # Assert
+        assert result.prompt_tokens == 0
+        assert result.completion_tokens == 20
+        assert result.total_tokens == 20