diff --git a/libs/partners/deepseek/tests/unit_tests/test_chat_models.py b/libs/partners/deepseek/tests/unit_tests/test_chat_models.py
index 7f1dc4082e0..2bb61a0fa70 100644
--- a/libs/partners/deepseek/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/deepseek/tests/unit_tests/test_chat_models.py
@@ -5,7 +5,6 @@ from __future__ import annotations
 from typing import Any, Literal, Union
 from unittest.mock import MagicMock
 
-import pydantic
 from langchain_core.messages import AIMessageChunk, ToolMessage
 from langchain_tests.unit_tests import ChatModelUnitTests
 from openai import BaseModel
@@ -14,10 +13,6 @@ from pydantic import SecretStr
 
 from langchain_deepseek.chat_models import ChatDeepSeek
 
-# patch validation to ignore leading underscores due to OpenAI client issue
-# TODO: remove when fixed in OpenAI client
-pydantic._internal._model_construction.is_valid_field_name = lambda name: True
-
 
 class MockOpenAIResponse(BaseModel):
     choices: list
diff --git a/libs/partners/xai/tests/unit_tests/test_chat_models.py b/libs/partners/xai/tests/unit_tests/test_chat_models.py
index b5af091004a..78c7a495153 100644
--- a/libs/partners/xai/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/xai/tests/unit_tests/test_chat_models.py
@@ -1,6 +1,5 @@
 import json
 
-import pydantic
 import pytest  # type: ignore[import-not-found]
 from langchain_core.messages import (
     AIMessage,
@@ -16,10 +15,6 @@ from langchain_openai.chat_models.base import (
 
 from langchain_xai import ChatXAI
 
-# patch validation to ignore leading underscores due to OpenAI client issue
-# TODO: remove when fixed in OpenAI client
-pydantic._internal._model_construction.is_valid_field_name = lambda name: True
-
 MODEL_NAME = "grok-4"