diff --git a/litellm/responses/streaming_iterator.py b/litellm/responses/streaming_iterator.py
index 88d963c94e..c016e71e7e 100644
--- a/litellm/responses/streaming_iterator.py
+++ b/litellm/responses/streaming_iterator.py
@@ -36,7 +36,7 @@ class BaseResponsesAPIStreamingIterator:
         self.logging_obj = logging_obj
         self.finished = False
         self.responses_api_provider_config = responses_api_provider_config
-        self.completed_response = None
+        self.completed_response: Optional[ResponsesAPIStreamingResponse] = None
         self.start_time = datetime.now()
 
     def _process_chunk(self, chunk):
@@ -102,7 +102,6 @@ class ResponsesAPIStreamingIterator(BaseResponsesAPIStreamingIterator):
     ):
         super().__init__(response, model, responses_api_provider_config, logging_obj)
         self.stream_iterator = response.aiter_lines()
-        self.completed_response: Optional[ResponsesAPIStreamingResponse] = None
 
     def __aiter__(self):
         return self
diff --git a/litellm/responses/utils.py b/litellm/responses/utils.py
index 3a148aed03..49d850ec6a 100644
--- a/litellm/responses/utils.py
+++ b/litellm/responses/utils.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict, get_type_hints
+from typing import Any, Dict, cast, get_type_hints
 
 import litellm
 from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
@@ -73,7 +73,7 @@ class ResponsesAPIRequestUtils:
         """
         valid_keys = get_type_hints(ResponsesAPIOptionalRequestParams).keys()
         filtered_params = {k: v for k, v in params.items() if k in valid_keys}
-        return ResponsesAPIOptionalRequestParams(**filtered_params)
+        return cast(ResponsesAPIOptionalRequestParams, filtered_params)
 
 
 class ResponseAPILoggingUtils:
diff --git a/litellm/types/llms/openai.py b/litellm/types/llms/openai.py
index 58cb2ab479..5b811830e7 100644
--- a/litellm/types/llms/openai.py
+++ b/litellm/types/llms/openai.py
@@ -35,7 +35,6 @@ from openai.types.embedding import Embedding as OpenAIEmbedding
 from openai.types.fine_tuning.fine_tuning_job import FineTuningJob
 from openai.types.responses.response import (
     IncompleteDetails,
-    Reasoning,
     Response,
     ResponseOutputItem,
     ResponseTextConfig,