diff --git a/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py b/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py
index 34198d0fb958c..03a1fc734afb4 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py
+++ b/libs/partners/openai/tests/unit_tests/chat_models/test_base_standard.py
@@ -1,6 +1,6 @@
 """Standard LangChain interface tests"""
 
-from typing import Type
+from typing import Tuple, Type
 
 from langchain_core.language_models import BaseChatModel
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
@@ -12,3 +12,21 @@ class TestOpenAIStandard(ChatModelUnitTests):
     @property
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatOpenAI
+
+    @property
+    def init_from_env_params(self) -> Tuple[dict, dict, dict]:
+        return (
+            {
+                "OPENAI_API_KEY": "api_key",
+                "OPENAI_ORGANIZATION": "org_id",
+                "OPENAI_API_BASE": "api_base",
+                "OPENAI_PROXY": "https://proxy.com",
+            },
+            {},
+            {
+                "openai_api_key": "api_key",
+                "openai_organization": "org_id",
+                "openai_api_base": "api_base",
+                "openai_proxy": "https://proxy.com",
+            },
+        )
diff --git a/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py b/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py
index 6597b16177be4..f3a49b6c341ec 100644
--- a/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py
+++ b/libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py
@@ -1,11 +1,12 @@
 """Unit tests for chat models."""
-
+import os
 from abc import abstractmethod
-from typing import Any, List, Literal, Optional, Type
+from typing import Any, List, Literal, Optional, Tuple, Type
+from unittest import mock
 
 import pytest
 from langchain_core.language_models import BaseChatModel
-from langchain_core.pydantic_v1 import BaseModel, Field
+from langchain_core.pydantic_v1 import BaseModel, Field, SecretStr
 from langchain_core.runnables import RunnableBinding
 from langchain_core.tools import tool
 
@@ -132,12 +133,30 @@ def standard_chat_model_params(self) -> dict:
         params["api_key"] = "test"
         return params
 
+    @property
+    def init_from_env_params(self) -> Tuple[dict, dict, dict]:
+        """Return env vars, init args, and expected instance attrs for initializing
+        from env vars."""
+        return {}, {}, {}
+
     def test_init(self) -> None:
         model = self.chat_model_class(
             **{**self.standard_chat_model_params, **self.chat_model_params}
         )
         assert model is not None
 
+    def test_init_from_env(self) -> None:
+        env_params, model_params, expected_attrs = self.init_from_env_params
+        if env_params:
+            with mock.patch.dict(os.environ, env_params):
+                model = self.chat_model_class(**model_params)
+            assert model is not None
+            for k, expected in expected_attrs.items():
+                actual = getattr(model, k)
+                if isinstance(actual, SecretStr):
+                    actual = actual.get_secret_value()
+                assert actual == expected
+
     def test_init_streaming(
         self,
     ) -> None:
diff --git a/libs/standard-tests/langchain_standard_tests/unit_tests/embeddings.py b/libs/standard-tests/langchain_standard_tests/unit_tests/embeddings.py
index 28e8c66bbd6fd..0a6e793c06327 100644
--- a/libs/standard-tests/langchain_standard_tests/unit_tests/embeddings.py
+++ b/libs/standard-tests/langchain_standard_tests/unit_tests/embeddings.py
@@ -1,8 +1,11 @@
+import os
 from abc import abstractmethod
-from typing import Type
+from typing import Tuple, Type
+from unittest import mock
 
 import pytest
 from langchain_core.embeddings import Embeddings
+from langchain_core.pydantic_v1 import SecretStr
 
 from langchain_standard_tests.base import BaseStandardTests
 
@@ -26,3 +29,21 @@ class EmbeddingsUnitTests(EmbeddingsTests):
     def test_init(self) -> None:
         model = self.embeddings_class(**self.embedding_model_params)
         assert model is not None
+
+    @property
+    def init_from_env_params(self) -> Tuple[dict, dict, dict]:
+        """Return env vars, init args, and expected instance attrs for initializing
+        from env vars."""
+        return {}, {}, {}
+
+    def test_init_from_env(self) -> None:
+        env_params, embeddings_params, expected_attrs = self.init_from_env_params
+        if env_params:
+            with mock.patch.dict(os.environ, env_params):
+                model = self.embeddings_class(**embeddings_params)
+            assert model is not None
+            for k, expected in expected_attrs.items():
+                actual = getattr(model, k)
+                if isinstance(actual, SecretStr):
+                    actual = actual.get_secret_value()
+                assert actual == expected