diff --git a/src/openai/_legacy_response.py b/src/openai/_legacy_response.py
index 25680049dc..8880e5f104 100644
--- a/src/openai/_legacy_response.py
+++ b/src/openai/_legacy_response.py
@@ -205,6 +205,8 @@ def _parse(self, *, to: type[_T] | None = None) -> R | _T:
         if cast_to and is_annotated_type(cast_to):
             cast_to = extract_type_arg(cast_to, 0)
 
+        origin = get_origin(cast_to) or cast_to
+
         if self._stream:
             if to:
                 if not is_stream_class_type(to):
@@ -261,8 +263,6 @@ def _parse(self, *, to: type[_T] | None = None) -> R | _T:
         if cast_to == bool:
             return cast(R, response.text.lower() == "true")
 
-        origin = get_origin(cast_to) or cast_to
-
         if inspect.isclass(origin) and issubclass(origin, HttpxBinaryResponseContent):
             return cast(R, cast_to(response))  # type: ignore
 
diff --git a/src/openai/_response.py b/src/openai/_response.py
index 36c7ea1281..95e94e6537 100644
--- a/src/openai/_response.py
+++ b/src/openai/_response.py
@@ -136,6 +136,8 @@ def _parse(self, *, to: type[_T] | None = None) -> R | _T:
         if cast_to and is_annotated_type(cast_to):
             cast_to = extract_type_arg(cast_to, 0)
 
+        origin = get_origin(cast_to) or cast_to
+
         if self._is_sse_stream:
             if to:
                 if not is_stream_class_type(to):
@@ -195,8 +197,6 @@ def _parse(self, *, to: type[_T] | None = None) -> R | _T:
         if cast_to == bool:
             return cast(R, response.text.lower() == "true")
 
-        origin = get_origin(cast_to) or cast_to
-
         # handle the legacy binary response case
         if inspect.isclass(cast_to) and cast_to.__name__ == "HttpxBinaryResponseContent":
             return cast(R, cast_to(response))  # type: ignore