[Bug]: Search memory failed with Qwen3.5-xxx thinking mode (default enabled) #1265
Description
Describe the bug
Thinking mode is enabled by default since Qwen3.5-xxx (qwen3.5-plus, qwen3.5-flash) and memmachine search memory could not handle section in Pydantic model_validate_json()
2026-03-25 03:05:22,890 [ERROR] memmachine_server.semantic_memory.semantic_ingestion - Failed to process message 5 for semantic type profile
Traceback (most recent call last):
File "/app/.venv/lib/python3.12/site-packages/memmachine_server/semantic_memory/semantic_ingestion.py", line 163, in process_semantic_type
commands = await llm_feature_update(
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/pydantic/_internal/_validate_call.py", line 34, in wrapper_function
return await wrapper(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/memmachine_server/semantic_memory/semantic_llm.py", line 88, in llm_feature_update
parsed_output = await model.generate_parsed_response(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/memmachine_server/common/language_model/openai_responses_language_model.py", line 157, in generate_parsed_response
response = await self._client.with_options(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/resources/responses/responses.py", line 2825, in parse
return await self._post(
^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_base_client.py", line 1884, in post
return await self.request(cast_to, opts, stream=stream, stream_cls=stream_cls)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_base_client.py", line 1674, in request
return await self._process_response(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_base_client.py", line 1763, in _process_response
return await api_response.parse()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_response.py", line 432, in parse
parsed = self._options.post_parser(parsed)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/resources/responses/responses.py", line 2819, in parser
return parse_response(
^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/lib/_parsing/_responses.py", line 74, in parse_response
"parsed": parse_text(item.text, text_format=text_format),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/lib/_parsing/_responses.py", line 139, in parse_text
return cast(TextFormatT, model_parse_json(text_format, text))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_compat.py", line 171, in model_parse_json
return model.model_validate_json(data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/pydantic/main.py", line 766, in model_validate_json
return cls.__pydantic_validator__.validate_json(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.ValidationError: 1 validation error for _SemanticFeatureUpdateRes
Invalid JSON: expected value at line 1 column 1 [type=json_invalid, input_value='<think>\nThe user is sha...atabase work"\n }\n]', input_type=str]
For further information visit https://errors.pydantic.dev/2.12/v/json_invalid
2026-03-25 03:05:45,040 [INFO] httpx - HTTP Request: POST https://dashscope.aliyuncs.com/compatible-mode/v1/responses "HTTP/1.1 200 OK"
2026-03-25 03:05:45,041 [ERROR] memmachine_server.semantic_memory.semantic_ingestion - Failed to process message 6 for semantic type profile
Traceback (most recent call last):
File "/app/.venv/lib/python3.12/site-packages/memmachine_server/semantic_memory/semantic_ingestion.py", line 163, in process_semantic_type
commands = await llm_feature_update(
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/pydantic/_internal/_validate_call.py", line 34, in wrapper_function
return await wrapper(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/memmachine_server/semantic_memory/semantic_llm.py", line 88, in llm_feature_update
parsed_output = await model.generate_parsed_response(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/memmachine_server/common/language_model/openai_responses_language_model.py", line 157, in generate_parsed_response
response = await self._client.with_options(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/resources/responses/responses.py", line 2825, in parse
return await self._post(
^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_base_client.py", line 1884, in post
return await self.request(cast_to, opts, stream=stream, stream_cls=stream_cls)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_base_client.py", line 1674, in request
return await self._process_response(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_base_client.py", line 1763, in _process_response
return await api_response.parse()
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_response.py", line 432, in parse
parsed = self._options.post_parser(parsed)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/resources/responses/responses.py", line 2819, in parser
return parse_response(
^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/lib/_parsing/_responses.py", line 74, in parse_response
"parsed": parse_text(item.text, text_format=text_format),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/lib/_parsing/_responses.py", line 139, in parse_text
return cast(TextFormatT, model_parse_json(text_format, text))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/openai/_compat.py", line 171, in model_parse_json
return model.model_validate_json(data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/.venv/lib/python3.12/site-packages/pydantic/main.py", line 766, in model_validate_json
return cls.__pydantic_validator__.validate_json(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.ValidationError: 1 validation error for _SemanticFeatureUpdateRes
Invalid JSON: expected value at line 1 column 1 [type=json_invalid, input_value='<think>\nLooking at this...Third Board)"\n }\n]', input_type=str]
For further information visit https://errors.pydantic.dev/2.12/v/json_invalidSteps to reproduce
From Qwen official document, Thinking mode is enabled by default since qwen3.5
https://www.alibabacloud.com/help/en/model-studio/deep-thinking#19a4c1988fp6d
Expected behavior
Search memory may report such error and add memory works well.
Environment
MemMachine version 0.3.2
Additional context
No response