From f310209b6260f717331831ff2a730f361e114f16 Mon Sep 17 00:00:00 2001
From: Bae Jin Seong <jin-castle@users.noreply.github.com>
Date: Wed, 27 May 2026 11:23:01 +0900
Subject: [PATCH] fix: tolerate null response output when parsing responses

---
 src/openai/lib/_parsing/_responses.py |  2 +-
 tests/lib/responses/test_responses.py | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/openai/lib/_parsing/_responses.py b/src/openai/lib/_parsing/_responses.py
index 8853a0749f..36346177b8 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/tests/lib/responses/test_responses.py b/tests/lib/responses/test_responses.py
index 8e5f16df95..70aed9eb5b 100644
--- a/tests/lib/responses/test_responses.py
+++ b/tests/lib/responses/test_responses.py
@@ -7,7 +7,10 @@
 from inline_snapshot import snapshot
 
 from openai import OpenAI, AsyncOpenAI
+from openai._types import NOT_GIVEN
 from openai._utils import assert_signatures_in_sync
+from openai.types.responses import Response
+from openai.lib._parsing._responses import parse_response
 
 from ...conftest import base_url
 from ..snapshots import make_snapshot_request
@@ -41,6 +44,23 @@ def test_output_text(client: OpenAI, respx_mock: MockRouter) -> None:
     )
 
 
+def test_parse_response_allows_null_output() -> None:
+    response = Response.construct(
+        id="resp_123",
+        object="response",
+        created_at=0,
+        model="gpt-4o-mini",
+        output=None,
+        parallel_tool_calls=True,
+        tool_choice="auto",
+        tools=[],
+    )
+
+    parsed = parse_response(text_format=NOT_GIVEN, input_tools=NOT_GIVEN, response=response)
+
+    assert parsed.output == []
+
+
 @pytest.mark.parametrize("sync", [True, False], ids=["sync", "async"])
 def test_stream_method_definition_in_sync(sync: bool, client: OpenAI, async_client: AsyncOpenAI) -> None:
     checking_client: OpenAI | AsyncOpenAI = client if sync else async_client