diff --git a/libs/partners/anthropic/langchain_anthropic/_client_utils.py b/libs/partners/anthropic/langchain_anthropic/_client_utils.py
new file mode 100644
index 00000000000..b98b9e16433
--- /dev/null
+++ b/libs/partners/anthropic/langchain_anthropic/_client_utils.py
@@ -0,0 +1,75 @@
+"""Helpers for creating Anthropic API clients.
+
+This module allows for the caching of httpx clients to avoid creating new instances
+for each instance of ChatAnthropic.
+
+Logic is largely replicated from anthropic._base_client.
+"""
+
+import asyncio
+import os
+from functools import lru_cache
+from typing import Any, Optional
+
+import anthropic
+
+_NOT_GIVEN: Any = object()
+
+
+class _SyncHttpxClientWrapper(anthropic.DefaultHttpxClient):
+    """Borrowed from anthropic._base_client"""
+
+    def __del__(self) -> None:
+        if self.is_closed:
+            return
+
+        try:
+            self.close()
+        except Exception:
+            pass
+
+
+class _AsyncHttpxClientWrapper(anthropic.DefaultAsyncHttpxClient):
+    """Borrowed from anthropic._base_client"""
+
+    def __del__(self) -> None:
+        if self.is_closed:
+            return
+
+        try:
+            # TODO(someday): support non asyncio runtimes here
+            asyncio.get_running_loop().create_task(self.aclose())
+        except Exception:
+            pass
+
+
+@lru_cache
+def _get_default_httpx_client(
+    *,
+    base_url: Optional[str],
+    timeout: Any = _NOT_GIVEN,
+) -> _SyncHttpxClientWrapper:
+    kwargs: dict[str, Any] = {
+        "base_url": base_url
+        or os.environ.get("ANTHROPIC_BASE_URL")
+        or "https://api.anthropic.com",
+    }
+    if timeout is not _NOT_GIVEN:
+        kwargs["timeout"] = timeout
+    return _SyncHttpxClientWrapper(**kwargs)
+
+
+@lru_cache
+def _get_default_async_httpx_client(
+    *,
+    base_url: Optional[str],
+    timeout: Any = _NOT_GIVEN,
+) -> _AsyncHttpxClientWrapper:
+    kwargs: dict[str, Any] = {
+        "base_url": base_url
+        or os.environ.get("ANTHROPIC_BASE_URL")
+        or "https://api.anthropic.com",
+    }
+    if timeout is not _NOT_GIVEN:
+        kwargs["timeout"] = timeout
+    return _AsyncHttpxClientWrapper(**kwargs)
diff --git a/libs/partners/anthropic/langchain_anthropic/chat_models.py b/libs/partners/anthropic/langchain_anthropic/chat_models.py
index 417aeb7f44f..e30bf35a435 100644
--- a/libs/partners/anthropic/langchain_anthropic/chat_models.py
+++ b/libs/partners/anthropic/langchain_anthropic/chat_models.py
@@ -69,6 +69,10 @@ from pydantic import (
 )
 from typing_extensions import NotRequired, TypedDict
 
+from langchain_anthropic._client_utils import (
+    _get_default_async_httpx_client,
+    _get_default_httpx_client,
+)
 from langchain_anthropic.output_parsers import extract_tool_calls
 
 _message_type_lookups = {
@@ -1300,11 +1304,29 @@ class ChatAnthropic(BaseChatModel):
 
     @cached_property
     def _client(self) -> anthropic.Client:
-        return anthropic.Client(**self._client_params)
+        client_params = self._client_params
+        http_client_params = {"base_url": client_params["base_url"]}
+        if "timeout" in client_params:
+            http_client_params["timeout"] = client_params["timeout"]
+        http_client = _get_default_httpx_client(**http_client_params)
+        params = {
+            **client_params,
+            "http_client": http_client,
+        }
+        return anthropic.Client(**params)
 
     @cached_property
     def _async_client(self) -> anthropic.AsyncClient:
-        return anthropic.AsyncClient(**self._client_params)
+        client_params = self._client_params
+        http_client_params = {"base_url": client_params["base_url"]}
+        if "timeout" in client_params:
+            http_client_params["timeout"] = client_params["timeout"]
+        http_client = _get_default_async_httpx_client(**http_client_params)
+        params = {
+            **client_params,
+            "http_client": http_client,
+        }
+        return anthropic.AsyncClient(**params)
 
     def _get_request_payload(
         self,
diff --git a/libs/partners/anthropic/tests/integration_tests/test_chat_models.py b/libs/partners/anthropic/tests/integration_tests/test_chat_models.py
index c40c5a4ab0a..93550c1fb55 100644
--- a/libs/partners/anthropic/tests/integration_tests/test_chat_models.py
+++ b/libs/partners/anthropic/tests/integration_tests/test_chat_models.py
@@ -1,5 +1,6 @@
 """Test ChatAnthropic chat model."""
 
+import asyncio
 import json
 import os
 from base64 import b64encode
@@ -1082,3 +1083,10 @@ def test_files_api_pdf(block_format: str) -> None:
         ],
     }
     _ = llm.invoke([input_message])
+
+
+def test_async_shared_client() -> None:
+    llm = ChatAnthropic(model="claude-3-5-haiku-latest")
+    llm._async_client  # Instantiates lazily
+    _ = asyncio.run(llm.ainvoke("Hello"))
+    _ = asyncio.run(llm.ainvoke("Hello"))
diff --git a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
index 2d418b6bddd..b0b0cc82b09 100644
--- a/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
+++ b/libs/partners/anthropic/tests/unit_tests/test_chat_models.py
@@ -44,6 +44,22 @@ def test_initialization() -> None:
         assert model.anthropic_api_url == "https://api.anthropic.com"
 
 
+def test_anthropic_client_caching() -> None:
+    """Test that the OpenAI client is cached."""
+    llm1 = ChatAnthropic(model="claude-3-5-sonnet-latest")
+    llm2 = ChatAnthropic(model="claude-3-5-sonnet-latest")
+    assert llm1._client._client is llm2._client._client
+
+    llm3 = ChatAnthropic(model="claude-3-5-sonnet-latest", base_url="foo")
+    assert llm1._client._client is not llm3._client._client
+
+    llm4 = ChatAnthropic(model="claude-3-5-sonnet-latest", timeout=None)
+    assert llm1._client._client is llm4._client._client
+
+    llm5 = ChatAnthropic(model="claude-3-5-sonnet-latest", timeout=3)
+    assert llm1._client._client is not llm5._client._client
+
+
 @pytest.mark.requires("anthropic")
 def test_anthropic_model_name_param() -> None:
     llm = ChatAnthropic(model_name="foo")  # type: ignore[call-arg, call-arg]