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fix(bedrock): use the Bedrock Messages API version by default #2032

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fix(bedrock): use the Bedrock Messages API version by default #2032

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4 changes: 2 additions & 2 deletions src/anthropic/lib/bedrock/_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,6 @@
from ..._client import _keep_client_header_params
from ..._compat import model_copy
from ..._version import __version__
from ..._constants import ANTHROPIC_API_VERSION
from ..._streaming import Stream, AsyncStream
from ..._exceptions import AnthropicError, APIStatusError
from ..._middleware import MiddlewareInput
Expand All @@ -32,13 +31,14 @@

_HttpxClientT = TypeVar("_HttpxClientT", bound=Union[httpx2.Client, httpx2.AsyncClient])
_DefaultStreamT = TypeVar("_DefaultStreamT", bound=Union[Stream[Any], AsyncStream[Any]])
DEFAULT_VERSION = "bedrock-2023-05-31"


def _prepare_options(input_options: FinalRequestOptions) -> FinalRequestOptions:
options = model_copy(_keep_client_header_params(input_options), deep=True)

if is_dict(options.json_data):
options.json_data.setdefault("anthropic_version", ANTHROPIC_API_VERSION)
options.json_data.setdefault("anthropic_version", DEFAULT_VERSION)

if is_given(options.headers):
betas = build_headers(options.headers)[0].get("anthropic-beta")
Expand Down
19 changes: 17 additions & 2 deletions tests/lib/test_bedrock.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,6 @@
from anthropic import APIStatusError, AnthropicBedrock, AsyncAnthropicBedrock, beta_tool, beta_async_tool
from anthropic._compat import PYDANTIC_V1
from anthropic._models import FinalRequestOptions
from anthropic._constants import ANTHROPIC_API_VERSION
from anthropic.lib.bedrock._client import _prepare_options
from anthropic.lib.bedrock._stream_decoder import _chunk_bytes_to_sse

Expand Down Expand Up @@ -203,6 +202,22 @@ def test_extra_body_anthropic_version_wins(respx_mock: MockRouter) -> None:
assert json.loads(request.content)["anthropic_version"] == "2000-01-01"


@pytest.mark.respx()
def test_default_anthropic_version_is_bedrock_compatible(respx_mock: MockRouter) -> None:
respx_mock.post(re.compile(r"https://bedrock-runtime\.us-east-1\.amazonaws\.com/model/.*/invoke")).mock(
return_value=httpx2.Response(200, json={"foo": "bar"}),
)

sync_client.messages.create(
max_tokens=16,
messages=[{"role": "user", "content": "Say ok"}],
model="anthropic.claude-sonnet-4-5-20250929-v1:0",
)

request = cast("list[MockRequestCall]", respx_mock.calls)[0].request
assert json.loads(request.content)["anthropic_version"] == "bedrock-2023-05-31"


@pytest.mark.respx()
@pytest.mark.asyncio()
async def test_extra_body_anthropic_version_wins_async(respx_mock: MockRouter) -> None:
Expand Down Expand Up @@ -582,7 +597,7 @@ def _assert_tool_runner_calls(calls: t.List[MockRequestCall]) -> None:
assert "anthropic-version" not in call.request.headers
body = json.loads(call.request.content)
assert "model" not in body and "stream" not in body and "output_format" not in body
assert body["anthropic_version"] == ANTHROPIC_API_VERSION
assert body["anthropic_version"] == "bedrock-2023-05-31"
second = json.loads(calls[1].request.content)
assert [m["role"] for m in second["messages"]] == ["user", "assistant", "user"]
assert second["messages"][1]["content"][0]["type"] == "tool_use"
Expand Down