diff --git a/litellm/litellm_core_utils/get_llm_provider_logic.py b/litellm/litellm_core_utils/get_llm_provider_logic.py
index b753e9fa8b5..21d69177336 100644
--- a/litellm/litellm_core_utils/get_llm_provider_logic.py
+++ b/litellm/litellm_core_utils/get_llm_provider_logic.py
@@ -913,6 +913,14 @@ def _get_openai_compatible_provider_info(  # noqa: PLR0915
             or "http://localhost:2024"
         )
         dynamic_api_key = api_key or get_secret_str("LANGGRAPH_API_KEY")
+    elif custom_llm_provider == "manus":
+        # Manus is OpenAI compatible for responses API
+        api_base = (
+            api_base
+            or get_secret_str("MANUS_API_BASE")
+            or "https://api.manus.im"
+        )
+        dynamic_api_key = api_key or get_secret_str("MANUS_API_KEY")
 
     if api_base is not None and not isinstance(api_base, str):
         raise Exception("api base needs to be a string. api_base={}".format(api_base))
diff --git a/litellm/llms/manus/responses/transformation.py b/litellm/llms/manus/responses/transformation.py
index 6b4c93a1f7b..5666c5e453a 100644
--- a/litellm/llms/manus/responses/transformation.py
+++ b/litellm/llms/manus/responses/transformation.py
@@ -13,6 +13,7 @@ from litellm.llms.openai.common_utils import OpenAIError
 from litellm.llms.openai.responses.transformation import OpenAIResponsesAPIConfig
 from litellm.secret_managers.main import get_secret_str
 from litellm.types.llms.openai import (
+    ResponseAPIUsage,
     ResponseInputParam,
     ResponsesAPIOptionalRequestParams,
     ResponsesAPIResponse,
@@ -195,6 +196,24 @@ class ManusResponsesAPIConfig(OpenAIResponsesAPIConfig):
         raw_response_headers = dict(raw_response.headers)
         processed_headers = process_response_headers(raw_response_headers)
         
+        # Ensure reasoning is an empty dict if not present, OpenAI SDK does not allow None
+        if "reasoning" not in raw_response_json or raw_response_json.get("reasoning") is None:
+            raw_response_json["reasoning"] = {}
+        
+        if "text" not in raw_response_json or raw_response_json.get("text") is None:
+            raw_response_json["text"] = {}
+        
+        if "output" not in raw_response_json or raw_response_json.get("output") is None:
+            raw_response_json["output"] = []
+        
+        # Ensure usage is present with default values if not provided
+        if "usage" not in raw_response_json or raw_response_json.get("usage") is None:
+            raw_response_json["usage"] = ResponseAPIUsage(
+                input_tokens=0,
+                output_tokens=0,
+                total_tokens=0,
+            )
+        
         try:
             response = ResponsesAPIResponse(**raw_response_json)
         except Exception:
diff --git a/tests/llm_responses_api_testing/base_responses_api.py b/tests/llm_responses_api_testing/base_responses_api.py
index f68b373feae..439315c284a 100644
--- a/tests/llm_responses_api_testing/base_responses_api.py
+++ b/tests/llm_responses_api_testing/base_responses_api.py
@@ -54,9 +54,10 @@ def validate_responses_api_response(response, final_chunk: bool = False):
     assert "created_at" in response and isinstance(
         response["created_at"], int
     ), "Response should have an integer 'created_at' field"
-    assert "output" in response and isinstance(
-        response["output"], list
-    ), "Response should have a list 'output' field"
+    if response.get("status") == "completed":
+        assert "output" in response and isinstance(
+            response["output"], list
+        ), "Response should have a list 'output' field"
 
     # Optional fields with their expected types
     optional_fields = {
@@ -91,7 +92,7 @@ def validate_responses_api_response(response, final_chunk: bool = False):
             ), f"Field '{field}' should be of type {expected_type}, but got {type(response[field])}"
 
     # Check if output has at least one item
-    if final_chunk is True:
+    if final_chunk is True and response.get("status") == "completed":
         assert (
             len(response["output"]) > 0
         ), "Response 'output' field should have at least one item"