diff --git a/src/anthropic/lib/bedrock/_client.py b/src/anthropic/lib/bedrock/_client.py
index b3f388e5..f7298adc 100644
--- a/src/anthropic/lib/bedrock/_client.py
+++ b/src/anthropic/lib/bedrock/_client.py
@@ -9,6 +9,7 @@
 from ... import _exceptions
 from ..._types import NOT_GIVEN, Timeout, NotGiven
 from ..._utils import is_dict, is_given
+from ..._compat import model_copy
 from ..._version import __version__
 from ..._streaming import Stream, AsyncStream
 from ..._exceptions import APIStatusError
@@ -29,28 +30,27 @@
 _DefaultStreamT = TypeVar("_DefaultStreamT", bound=Union[Stream[Any], AsyncStream[Any]])
 
 
-class BaseBedrockClient(BaseClient[_HttpxClientT, _DefaultStreamT]):
-    @override
-    def _build_request(
-        self,
-        options: FinalRequestOptions,
-    ) -> httpx.Request:
-        if is_dict(options.json_data):
-            options.json_data.setdefault("anthropic_version", DEFAULT_VERSION)
+def _prepare_options(input_options: FinalRequestOptions) -> FinalRequestOptions:
+    options = model_copy(input_options, deep=True)
+
+    if is_dict(options.json_data):
+        options.json_data.setdefault("anthropic_version", DEFAULT_VERSION)
+
+    if options.url in {"/v1/complete", "/v1/messages"} and options.method == "post":
+        if not is_dict(options.json_data):
+            raise RuntimeError("Expected dictionary json_data for post /completions endpoint")
 
-        if options.url in {"/v1/complete", "/v1/messages"} and options.method == "post":
-            if not is_dict(options.json_data):
-                raise RuntimeError("Expected dictionary json_data for post /completions endpoint")
+        model = options.json_data.pop("model", None)
+        stream = options.json_data.pop("stream", False)
+        if stream:
+            options.url = f"/model/{model}/invoke-with-response-stream"
+        else:
+            options.url = f"/model/{model}/invoke"
 
-            model = options.json_data.pop("model", None)
-            stream = options.json_data.pop("stream", False)
-            if stream:
-                options.url = f"/model/{model}/invoke-with-response-stream"
-            else:
-                options.url = f"/model/{model}/invoke"
+    return options
 
-        return super()._build_request(options)
 
+class BaseBedrockClient(BaseClient[_HttpxClientT, _DefaultStreamT]):
     @override
     def _make_status_error(
         self,
@@ -145,6 +145,10 @@ def __init__(
     def _make_sse_decoder(self) -> AWSEventStreamDecoder:
         return AWSEventStreamDecoder()
 
+    @override
+    def _prepare_options(self, options: FinalRequestOptions) -> FinalRequestOptions:
+        return _prepare_options(options)
+
     @override
     def _prepare_request(self, request: httpx.Request) -> None:
         from ._auth import get_auth_headers
@@ -280,6 +284,10 @@ def __init__(
     def _make_sse_decoder(self) -> AWSEventStreamDecoder:
         return AWSEventStreamDecoder()
 
+    @override
+    async def _prepare_options(self, options: FinalRequestOptions) -> FinalRequestOptions:
+        return _prepare_options(options)
+
     @override
     async def _prepare_request(self, request: httpx.Request) -> None:
         from ._auth import get_auth_headers
diff --git a/tests/lib/test_bedrock.py b/tests/lib/test_bedrock.py
new file mode 100644
index 00000000..5c4cf9f5
--- /dev/null
+++ b/tests/lib/test_bedrock.py
@@ -0,0 +1,93 @@
+import re
+from typing import cast
+from typing_extensions import Protocol
+
+import httpx
+import pytest
+from respx import MockRouter
+
+from anthropic import AnthropicBedrock, AsyncAnthropicBedrock
+
+sync_client = AnthropicBedrock(
+    aws_region="us-east-1",
+    aws_access_key="example-access-key",
+    aws_secret_key="example-secret-key",
+)
+async_client = AsyncAnthropicBedrock(
+    aws_region="us-east-1",
+    aws_access_key="example-access-key",
+    aws_secret_key="example-secret-key",
+)
+
+
+class MockRequestCall(Protocol):
+    request: httpx.Request
+
+
+@pytest.mark.respx()
+def test_messages_retries(respx_mock: MockRouter) -> None:
+    respx_mock.post(re.compile(r"https://bedrock-runtime\.us-east-1\.amazonaws\.com/model/.*/invoke")).mock(
+        side_effect=[
+            httpx.Response(500, json={"error": "server error"}),
+            httpx.Response(200, json={"foo": "bar"}),
+        ]
+    )
+
+    sync_client.messages.create(
+        max_tokens=1024,
+        messages=[
+            {
+                "role": "user",
+                "content": "Say hello there!",
+            }
+        ],
+        model="anthropic.claude-3-sonnet-20240229-v1:0",
+    )
+
+    calls = cast("list[MockRequestCall]", respx_mock.calls)
+
+    assert len(calls) == 2
+
+    assert (
+        calls[0].request.url
+        == "https://bedrock-runtime.us-east-1.amazonaws.com/model/anthropic.claude-3-sonnet-20240229-v1:0/invoke"
+    )
+    assert (
+        calls[1].request.url
+        == "https://bedrock-runtime.us-east-1.amazonaws.com/model/anthropic.claude-3-sonnet-20240229-v1:0/invoke"
+    )
+
+
+@pytest.mark.respx()
+@pytest.mark.asyncio()
+async def test_messages_retries_async(respx_mock: MockRouter) -> None:
+    respx_mock.post(re.compile(r"https://bedrock-runtime\.us-east-1\.amazonaws\.com/model/.*/invoke")).mock(
+        side_effect=[
+            httpx.Response(500, json={"error": "server error"}),
+            httpx.Response(200, json={"foo": "bar"}),
+        ]
+    )
+
+    await async_client.messages.create(
+        max_tokens=1024,
+        messages=[
+            {
+                "role": "user",
+                "content": "Say hello there!",
+            }
+        ],
+        model="anthropic.claude-3-sonnet-20240229-v1:0",
+    )
+
+    calls = cast("list[MockRequestCall]", respx_mock.calls)
+
+    assert len(calls) == 2
+
+    assert (
+        calls[0].request.url
+        == "https://bedrock-runtime.us-east-1.amazonaws.com/model/anthropic.claude-3-sonnet-20240229-v1:0/invoke"
+    )
+    assert (
+        calls[1].request.url
+        == "https://bedrock-runtime.us-east-1.amazonaws.com/model/anthropic.claude-3-sonnet-20240229-v1:0/invoke"
+    )