diff --git a/src/openai/lib/_parsing/_responses.py b/src/openai/lib/_parsing/_responses.py
index 8853a0749f..9a2914dcc0 100644
--- a/src/openai/lib/_parsing/_responses.py
+++ b/src/openai/lib/_parsing/_responses.py
@@ -58,7 +58,7 @@ def parse_response(
 ) -> ParsedResponse[TextFormatT]:
     output_list: List[ParsedResponseOutputItem[TextFormatT]] = []
 
-    for output in response.output:
+    for output in (response.output or []):
         if output.type == "message":
             content_list: List[ParsedContent[TextFormatT]] = []
             for item in output.content:
diff --git a/src/openai/types/responses/response.py b/src/openai/types/responses/response.py
index dac3e09a89..36c5616dfa 100644
--- a/src/openai/types/responses/response.py
+++ b/src/openai/types/responses/response.py
@@ -313,7 +313,7 @@ def output_text(self) -> str:
         If no `output_text` content blocks exist, then an empty string is returned.
         """
         texts: List[str] = []
-        for output in self.output:
+        for output in (self.output or []):
             if output.type == "message":
                 for content in output.content:
                     if content.type == "output_text":