diff --git a/litellm/litellm_core_utils/litellm_logging.py b/litellm/litellm_core_utils/litellm_logging.py
index 8a07ac9a8e..964bbfb70c 100644
--- a/litellm/litellm_core_utils/litellm_logging.py
+++ b/litellm/litellm_core_utils/litellm_logging.py
@@ -45,6 +45,7 @@ from litellm.types.llms.openai import (
     Batch,
     FineTuningJob,
     HttpxBinaryResponseContent,
+    ResponseCompletedEvent,
     ResponsesAPIResponse,
 )
 from litellm.types.rerank import RerankResponse
@@ -854,6 +855,7 @@ class Logging(LiteLLMLoggingBaseClass):
             Batch,
             FineTuningJob,
             ResponsesAPIResponse,
+            ResponseCompletedEvent,
         ],
         cache_hit: Optional[bool] = None,
     ) -> Optional[float]:
@@ -1000,9 +1002,7 @@ class Logging(LiteLLMLoggingBaseClass):
             ## if model in model cost map - log the response cost
             ## else set cost to None
             if (
-                standard_logging_object is None
-                and result is not None
-                and self.stream is not True
+                standard_logging_object is None and result is not None
             ):  # handle streaming separately
                 if (
                     isinstance(result, ModelResponse)
@@ -1016,6 +1016,7 @@ class Logging(LiteLLMLoggingBaseClass):
                     or isinstance(result, FineTuningJob)
                     or isinstance(result, LiteLLMBatch)
                     or isinstance(result, ResponsesAPIResponse)
+                    or isinstance(result, ResponseCompletedEvent)
                 ):
                     ## HIDDEN PARAMS ##
                     hidden_params = getattr(result, "_hidden_params", {})
diff --git a/litellm/responses/streaming_iterator.py b/litellm/responses/streaming_iterator.py
index b99d81309a..7464d04607 100644
--- a/litellm/responses/streaming_iterator.py
+++ b/litellm/responses/streaming_iterator.py
@@ -9,6 +9,7 @@ from litellm.litellm_core_utils.litellm_logging import Logging as LiteLLMLogging
 from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
 from litellm.types.llms.openai import (
     ResponsesAPIResponse,
+    ResponsesAPIStreamEvents,
     ResponsesAPIStreamingResponse,
 )
 from litellm.utils import CustomStreamWrapper
@@ -82,21 +83,20 @@ class ResponsesAPIStreamingIterator:
                     if (
                         openai_responses_api_chunk
                         and openai_responses_api_chunk.type
-                        == COMPLETED_OPENAI_CHUNK_TYPE
+                        == ResponsesAPIStreamEvents.RESPONSE_COMPLETED
                     ):
                         self.completed_response = openai_responses_api_chunk
-                        await self.logging_obj.async_success_handler(
-                            result=self.completed_response,
-                            start_time=self.start_time,
-                            end_time=datetime.now(),
-                            cache_hit=None,
+                        asyncio.create_task(
+                            self.logging_obj.async_success_handler(
+                                result=self.completed_response,
+                                start_time=self.start_time,
+                                end_time=datetime.now(),
+                                cache_hit=None,
+                            )
                         )
                     return openai_responses_api_chunk
 
-                return ResponsesAPIStreamingResponse(
-                    type="response", response=parsed_chunk
-                )
-
+                return await self.__anext__()
             except json.JSONDecodeError:
                 # If we can't parse the chunk, continue to the next one
                 return await self.__anext__()
diff --git a/litellm/types/llms/openai.py b/litellm/types/llms/openai.py
index 5d6adc263e..9e55ac30e9 100644
--- a/litellm/types/llms/openai.py
+++ b/litellm/types/llms/openai.py
@@ -852,44 +852,56 @@ class ResponsesAPIStreamEvents(str, Enum):
 
 
 # Base streaming response types
-class ResponseCreatedEvent(BaseModel):
+class BaseResponseAPIStreamEvent(BaseModel):
+    def __getitem__(self, key):
+        return self.__dict__[key]
+
+    def get(self, key, default=None):
+        return self.__dict__.get(key, default)
+
+    def __contains__(self, key):
+        return key in self.__dict__
+
+
+class ResponseCreatedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.RESPONSE_CREATED]
     response: ResponsesAPIResponse
 
 
-class ResponseInProgressEvent(BaseModel):
+class ResponseInProgressEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.RESPONSE_IN_PROGRESS]
     response: ResponsesAPIResponse
 
 
-class ResponseCompletedEvent(BaseModel):
+class ResponseCompletedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.RESPONSE_COMPLETED]
     response: ResponsesAPIResponse
+    _hidden_params: dict = PrivateAttr(default_factory=dict)
 
 
-class ResponseFailedEvent(BaseModel):
+class ResponseFailedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.RESPONSE_FAILED]
     response: ResponsesAPIResponse
 
 
-class ResponseIncompleteEvent(BaseModel):
+class ResponseIncompleteEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.RESPONSE_INCOMPLETE]
     response: ResponsesAPIResponse
 
 
-class OutputItemAddedEvent(BaseModel):
+class OutputItemAddedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.OUTPUT_ITEM_ADDED]
     output_index: int
     item: dict
 
 
-class OutputItemDoneEvent(BaseModel):
+class OutputItemDoneEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.OUTPUT_ITEM_DONE]
     output_index: int
     item: dict
 
 
-class ContentPartAddedEvent(BaseModel):
+class ContentPartAddedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.CONTENT_PART_ADDED]
     item_id: str
     output_index: int
@@ -897,7 +909,7 @@ class ContentPartAddedEvent(BaseModel):
     part: dict
 
 
-class ContentPartDoneEvent(BaseModel):
+class ContentPartDoneEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.CONTENT_PART_DONE]
     item_id: str
     output_index: int
@@ -905,7 +917,7 @@ class ContentPartDoneEvent(BaseModel):
     part: dict
 
 
-class OutputTextDeltaEvent(BaseModel):
+class OutputTextDeltaEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.OUTPUT_TEXT_DELTA]
     item_id: str
     output_index: int
@@ -913,7 +925,7 @@ class OutputTextDeltaEvent(BaseModel):
     delta: str
 
 
-class OutputTextAnnotationAddedEvent(BaseModel):
+class OutputTextAnnotationAddedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.OUTPUT_TEXT_ANNOTATION_ADDED]
     item_id: str
     output_index: int
@@ -922,7 +934,7 @@ class OutputTextAnnotationAddedEvent(BaseModel):
     annotation: dict
 
 
-class OutputTextDoneEvent(BaseModel):
+class OutputTextDoneEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.OUTPUT_TEXT_DONE]
     item_id: str
     output_index: int
@@ -930,7 +942,7 @@ class OutputTextDoneEvent(BaseModel):
     text: str
 
 
-class RefusalDeltaEvent(BaseModel):
+class RefusalDeltaEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.REFUSAL_DELTA]
     item_id: str
     output_index: int
@@ -938,7 +950,7 @@ class RefusalDeltaEvent(BaseModel):
     delta: str
 
 
-class RefusalDoneEvent(BaseModel):
+class RefusalDoneEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.REFUSAL_DONE]
     item_id: str
     output_index: int
@@ -946,57 +958,57 @@ class RefusalDoneEvent(BaseModel):
     refusal: str
 
 
-class FunctionCallArgumentsDeltaEvent(BaseModel):
+class FunctionCallArgumentsDeltaEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.FUNCTION_CALL_ARGUMENTS_DELTA]
     item_id: str
     output_index: int
     delta: str
 
 
-class FunctionCallArgumentsDoneEvent(BaseModel):
+class FunctionCallArgumentsDoneEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.FUNCTION_CALL_ARGUMENTS_DONE]
     item_id: str
     output_index: int
     arguments: str
 
 
-class FileSearchCallInProgressEvent(BaseModel):
+class FileSearchCallInProgressEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.FILE_SEARCH_CALL_IN_PROGRESS]
     output_index: int
     item_id: str
 
 
-class FileSearchCallSearchingEvent(BaseModel):
+class FileSearchCallSearchingEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.FILE_SEARCH_CALL_SEARCHING]
     output_index: int
     item_id: str
 
 
-class FileSearchCallCompletedEvent(BaseModel):
+class FileSearchCallCompletedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.FILE_SEARCH_CALL_COMPLETED]
     output_index: int
     item_id: str
 
 
-class WebSearchCallInProgressEvent(BaseModel):
+class WebSearchCallInProgressEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.WEB_SEARCH_CALL_IN_PROGRESS]
     output_index: int
     item_id: str
 
 
-class WebSearchCallSearchingEvent(BaseModel):
+class WebSearchCallSearchingEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.WEB_SEARCH_CALL_SEARCHING]
     output_index: int
     item_id: str
 
 
-class WebSearchCallCompletedEvent(BaseModel):
+class WebSearchCallCompletedEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.WEB_SEARCH_CALL_COMPLETED]
     output_index: int
     item_id: str
 
 
-class ErrorEvent(BaseModel):
+class ErrorEvent(BaseResponseAPIStreamEvent):
     type: Literal[ResponsesAPIStreamEvents.ERROR]
     code: Optional[str]
     message: str