diff --git a/litellm/llms/custom_httpx/llm_http_handler.py b/litellm/llms/custom_httpx/llm_http_handler.py
index 9d67fd1a85..b8b7af686d 100644
--- a/litellm/llms/custom_httpx/llm_http_handler.py
+++ b/litellm/llms/custom_httpx/llm_http_handler.py
@@ -11,12 +11,14 @@ import litellm.types.utils
 from litellm.llms.base_llm.chat.transformation import BaseConfig
 from litellm.llms.base_llm.embedding.transformation import BaseEmbeddingConfig
 from litellm.llms.base_llm.rerank.transformation import BaseRerankConfig
+from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
 from litellm.llms.custom_httpx.http_handler import (
     AsyncHTTPHandler,
     HTTPHandler,
     _get_httpx_client,
     get_async_httpx_client,
 )
+from litellm.types.llms.openai import ResponseInputParam, ResponsesAPIRequestParams
 from litellm.types.rerank import OptionalRerankParams, RerankResponse
 from litellm.types.utils import EmbeddingResponse, FileTypes, TranscriptionResponse
 from litellm.utils import CustomStreamWrapper, ModelResponse, ProviderConfigManager
@@ -952,6 +954,15 @@ class BaseLLMHTTPHandler:
             return returned_response
         return model_response
 
+    async def async_response_api_handler(
+        self,
+        model: str,
+        input: Union[str, ResponseInputParam],
+        responses_api_provider_config: BaseResponsesAPIConfig,
+        responses_api_request_params: ResponsesAPIRequestParams,
+    ) -> Any:
+        pass
+
     def _handle_error(
         self, e: Exception, provider_config: Union[BaseConfig, BaseRerankConfig]
     ):
diff --git a/litellm/responses/main.py b/litellm/responses/main.py
index 96a99615c2..0920d25d17 100644
--- a/litellm/responses/main.py
+++ b/litellm/responses/main.py
@@ -2,6 +2,13 @@ from typing import Any, Dict, Iterable, List, Literal, Optional, Union
 
 import httpx
 
+import litellm
+from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
+from litellm.llms.custom_httpx.llm_http_handler import BaseLLMHTTPHandler
+from litellm.responses.utils import (
+    ResponsesAPIRequestParams,
+    get_optional_params_responses_api,
+)
 from litellm.types.llms.openai import (
     Reasoning,
     ResponseIncludable,
@@ -10,6 +17,13 @@ from litellm.types.llms.openai import (
     ToolChoice,
     ToolParam,
 )
+from litellm.types.router import GenericLiteLLMParams
+from litellm.utils import ProviderConfigManager
+
+####### ENVIRONMENT VARIABLES ###################
+# Initialize any necessary instances or variables here
+base_llm_http_handler = BaseLLMHTTPHandler()
+#################################################
 
 
 async def aresponses(
@@ -37,7 +51,55 @@ async def aresponses(
     extra_query: Optional[Dict[str, Any]] = None,
     extra_body: Optional[Dict[str, Any]] = None,
     timeout: Optional[Union[float, httpx.Timeout]] = None,
+    **kwargs,
 ):
+
+    # get llm provider logic
+    litellm_params = GenericLiteLLMParams(**kwargs)
+    model, custom_llm_provider, dynamic_api_key, dynamic_api_base = (
+        litellm.get_llm_provider(
+            model=model,
+            custom_llm_provider=kwargs.get("custom_llm_provider", None),
+            api_base=litellm_params.api_base,
+            api_key=litellm_params.api_key,
+        )
+    )
+
+    # get provider config
+    responses_api_provider_config: Optional[BaseResponsesAPIConfig] = (
+        ProviderConfigManager.get_provider_responses_api_config(
+            model=model,
+            provider=litellm.LlmProviders(custom_llm_provider),
+        )
+    )
+
+    if responses_api_provider_config is None:
+        raise litellm.BadRequestError(
+            model=model,
+            llm_provider=custom_llm_provider,
+            message=f"Responses API not available for custom_llm_provider={custom_llm_provider}, model: {model}",
+        )
+
+    # Get all parameters using locals() and combine with kwargs
+    all_params = {**locals(), **kwargs}
+
+    # Get optional parameters for the responses API
+    responses_api_request_params: ResponsesAPIRequestParams = (
+        get_optional_params_responses_api(
+            model=model,
+            responses_api_provider_config=responses_api_provider_config,
+            optional_params={**locals(), **kwargs},
+        )
+    )
+
+    response = await base_llm_http_handler.async_response_api_handler(
+        model=model,
+        input=input,
+        responses_api_provider_config=responses_api_provider_config,
+        responses_api_request_params=responses_api_request_params,
+    )
+    return response
+
     pass
 
 
diff --git a/litellm/responses/utils.py b/litellm/responses/utils.py
new file mode 100644
index 0000000000..51a77bc23c
--- /dev/null
+++ b/litellm/responses/utils.py
@@ -0,0 +1,46 @@
+from typing import Any, Dict
+
+import litellm
+from litellm.llms.base_llm.responses.transformation import BaseResponsesAPIConfig
+from litellm.types.llms.openai import ResponsesAPIRequestParams
+
+
+def get_optional_params_responses_api(
+    model: str,
+    responses_api_provider_config: BaseResponsesAPIConfig,
+    optional_params: Dict[str, Any],
+) -> ResponsesAPIRequestParams:
+    """
+    Get optional parameters for the responses API.
+
+    Args:
+        params: Dictionary of all parameters
+        model: The model name
+        responses_api_provider_config: The provider configuration for responses API
+
+    Returns:
+        A dictionary of supported parameters for the responses API
+    """
+    # Remove None values and internal parameters
+    filtered_params = {k: v for k, v in optional_params.items() if v is not None}
+
+    # Get supported parameters for the model
+    supported_params = responses_api_provider_config.get_supported_openai_params(model)
+
+    # Check for unsupported parameters
+    unsupported_params = [
+        param for param in filtered_params if param not in supported_params
+    ]
+
+    if unsupported_params:
+        raise litellm.UnsupportedParamsError(
+            model=model,
+            message=f"The following parameters are not supported for model {model}: {', '.join(unsupported_params)}",
+        )
+
+    # Map parameters to provider-specific format
+    mapped_params = responses_api_provider_config.map_openai_params(
+        optional_params=filtered_params, model=model, drop_params=litellm.drop_params
+    )
+
+    return mapped_params