diff --git a/src/anthropic/_legacy_response.py b/src/anthropic/_legacy_response.py
index 45a5a87a..826f0c0a 100644
--- a/src/anthropic/_legacy_response.py
+++ b/src/anthropic/_legacy_response.py
@@ -255,6 +255,9 @@ def _parse(self, *, to: type[_T] | None = None) -> R | _T:
         if cast_to == float:
             return cast(R, float(response.text))
 
+        if cast_to == bool:
+            return cast(R, response.text.lower() == "true")
+
         origin = get_origin(cast_to) or cast_to
 
         if inspect.isclass(origin) and issubclass(origin, HttpxBinaryResponseContent):
diff --git a/src/anthropic/_response.py b/src/anthropic/_response.py
index 17aa3532..c50edf4f 100644
--- a/src/anthropic/_response.py
+++ b/src/anthropic/_response.py
@@ -192,6 +192,9 @@ def _parse(self, *, to: type[_T] | None = None) -> R | _T:
         if cast_to == float:
             return cast(R, float(response.text))
 
+        if cast_to == bool:
+            return cast(R, response.text.lower() == "true")
+
         origin = get_origin(cast_to) or cast_to
 
         # handle the legacy binary response case
diff --git a/tests/test_legacy_response.py b/tests/test_legacy_response.py
index 4083d179..ae245e69 100644
--- a/tests/test_legacy_response.py
+++ b/tests/test_legacy_response.py
@@ -32,6 +32,31 @@ def test_response_parse_mismatched_basemodel(client: Anthropic) -> None:
         response.parse(to=PydanticModel)
 
 
+@pytest.mark.parametrize(
+    "content, expected",
+    [
+        ("false", False),
+        ("true", True),
+        ("False", False),
+        ("True", True),
+        ("TrUe", True),
+        ("FalSe", False),
+    ],
+)
+def test_response_parse_bool(client: Anthropic, content: str, expected: bool) -> None:
+    response = LegacyAPIResponse(
+        raw=httpx.Response(200, content=content),
+        client=client,
+        stream=False,
+        stream_cls=None,
+        cast_to=str,
+        options=FinalRequestOptions.construct(method="get", url="/foo"),
+    )
+
+    result = response.parse(to=bool)
+    assert result is expected
+
+
 def test_response_parse_custom_stream(client: Anthropic) -> None:
     response = LegacyAPIResponse(
         raw=httpx.Response(200, content=b"foo"),
diff --git a/tests/test_response.py b/tests/test_response.py
index 9b51b8ed..48c069e2 100644
--- a/tests/test_response.py
+++ b/tests/test_response.py
@@ -190,6 +190,56 @@ async def test_async_response_parse_annotated_type(async_client: AsyncAnthropic)
     assert obj.bar == 2
 
 
+@pytest.mark.parametrize(
+    "content, expected",
+    [
+        ("false", False),
+        ("true", True),
+        ("False", False),
+        ("True", True),
+        ("TrUe", True),
+        ("FalSe", False),
+    ],
+)
+def test_response_parse_bool(client: Anthropic, content: str, expected: bool) -> None:
+    response = APIResponse(
+        raw=httpx.Response(200, content=content),
+        client=client,
+        stream=False,
+        stream_cls=None,
+        cast_to=str,
+        options=FinalRequestOptions.construct(method="get", url="/foo"),
+    )
+
+    result = response.parse(to=bool)
+    assert result is expected
+
+
+@pytest.mark.parametrize(
+    "content, expected",
+    [
+        ("false", False),
+        ("true", True),
+        ("False", False),
+        ("True", True),
+        ("TrUe", True),
+        ("FalSe", False),
+    ],
+)
+async def test_async_response_parse_bool(client: AsyncAnthropic, content: str, expected: bool) -> None:
+    response = AsyncAPIResponse(
+        raw=httpx.Response(200, content=content),
+        client=client,
+        stream=False,
+        stream_cls=None,
+        cast_to=str,
+        options=FinalRequestOptions.construct(method="get", url="/foo"),
+    )
+
+    result = await response.parse(to=bool)
+    assert result is expected
+
+
 class OtherModel(BaseModel):
     a: str