fix: handle null output_text content

src/openai/lib/_parsing/_responses.py

@@ -131,8 +131,8 @@ def parse_response(
     )
 
 
-def parse_text(text: str, text_format: type[TextFormatT] | Omit) -> TextFormatT | None:
-    if not is_given(text_format):
+def parse_text(text: str | None, text_format: type[TextFormatT] | Omit) -> TextFormatT | None:
+    if text is None or not is_given(text_format):
         return None
 
     if is_basemodel_type(text_format):

src/openai/types/responses/response.py

@@ -315,6 +315,7 @@ def output_text(self) -> str:
             if output.type == "message":
                 for content in output.content:
                     if content.type == "output_text":
-                        texts.append(content.text)
+                        if content.text is not None:
+                            texts.append(content.text)
 
         return "".join(texts)

src/openai/types/responses/response_output_text.py

@@ -122,8 +122,8 @@ class ResponseOutputText(BaseModel):
     annotations: List[Annotation]
     """The annotations of the text output."""
 
-    text: str
-    """The text output from the model."""
+    text: Optional[str] = None
+    """The text output from the model, when present."""
 
     type: Literal["output_text"]
     """The type of the output text. Always `output_text`."""

tests/lib/responses/test_responses.py

@@ -61,3 +61,21 @@ def test_parse_method_definition_in_sync(sync: bool, client: OpenAI, async_clien
         checking_client.responses.parse,
         exclude_params={"tools"},
     )
+
+
+@pytest.mark.respx(base_url=base_url)
+def test_output_text_ignores_null_text(client: OpenAI, respx_mock: MockRouter) -> None:
+    response = make_snapshot_request(
+        lambda c: c.responses.create(
+            model="gpt-4o-mini",
+            input="hi",
+        ),
+        content_snapshot=snapshot(
+            '{"id": "resp_null", "object": "response", "created_at": 1754925861, "status": "completed", "background": false, "error": null, "incomplete_details": null, "instructions": null, "max_output_tokens": null, "max_tool_calls": null, "model": "gpt-4o-mini-2024-07-18", "output": [{"id": "msg_null", "type": "message", "status": "completed", "content": [{"type": "output_text", "annotations": [], "logprobs": [], "text": null}, {"type": "output_text", "annotations": [], "logprobs": [], "text": "ok"}], "role": "assistant"}], "parallel_tool_calls": true, "previous_response_id": null, "prompt_cache_key": null, "reasoning": {"effort": null, "summary": null}, "safety_identifier": null, "service_tier": "default", "store": true, "temperature": 1.0, "text": {"format": {"type": "text"}, "verbosity": "medium"}, "tool_choice": "auto", "tools": [], "top_logprobs": 0, "top_p": 1.0, "truncation": "disabled", "usage": {"input_tokens": 1, "input_tokens_details": {"cached_tokens": 0}, "output_tokens": 1, "output_tokens_details": {"reasoning_tokens": 0}, "total_tokens": 2}, "user": null, "metadata": {}}'
+        ),
+        path="/responses",
+        mock_client=client,
+        respx_mock=respx_mock,
+    )
+
+    assert response.output_text == "ok"