src/anthropic/_legacy_response.py [293:361]:
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            raise RuntimeError("Unexpected state - cast_to is `APIResponse`")

        if inspect.isclass(
            origin  # pyright: ignore[reportUnknownArgumentType]
        ) and issubclass(origin, httpx.Response):
            # Because of the invariance of our ResponseT TypeVar, users can subclass httpx.Response
            # and pass that class to our request functions. We cannot change the variance to be either
            # covariant or contravariant as that makes our usage of ResponseT illegal. We could construct
            # the response class ourselves but that is something that should be supported directly in httpx
            # as it would be easy to incorrectly construct the Response object due to the multitude of arguments.
            if cast_to != httpx.Response:
                raise ValueError(f"Subclasses of httpx.Response cannot be passed to `cast_to`")
            return cast(R, response)

        if (
            inspect.isclass(
                origin  # pyright: ignore[reportUnknownArgumentType]
            )
            and not issubclass(origin, BaseModel)
            and issubclass(origin, pydantic.BaseModel)
        ):
            raise TypeError("Pydantic models must subclass our base model type, e.g. `from anthropic import BaseModel`")

        if (
            cast_to is not object
            and not origin is list
            and not origin is dict
            and not origin is Union
            and not issubclass(origin, BaseModel)
        ):
            raise RuntimeError(
                f"Unsupported type, expected {cast_to} to be a subclass of {BaseModel}, {dict}, {list}, {Union}, {NoneType}, {str} or {httpx.Response}."
            )

        # split is required to handle cases where additional information is included
        # in the response, e.g. application/json; charset=utf-8
        content_type, *_ = response.headers.get("content-type", "*").split(";")
        if not content_type.endswith("json"):
            if is_basemodel(cast_to):
                try:
                    data = response.json()
                except Exception as exc:
                    log.debug("Could not read JSON from response data due to %s - %s", type(exc), exc)
                else:
                    return self._client._process_response_data(
                        data=data,
                        cast_to=cast_to,  # type: ignore
                        response=response,
                    )

            if self._client._strict_response_validation:
                raise APIResponseValidationError(
                    response=response,
                    message=f"Expected Content-Type response header to be `application/json` but received `{content_type}` instead.",
                    body=response.text,
                )

            # If the API responds with content that isn't JSON then we just return
            # the (decoded) text without performing any parsing so that you can still
            # handle the response however you need to.
            return response.text  # type: ignore

        data = response.json()

        return self._client._process_response_data(
            data=data,
            cast_to=cast_to,  # type: ignore
            response=response,
        )
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src/anthropic/_response.py [227:295]:
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            raise RuntimeError("Unexpected state - cast_to is `APIResponse`")

        if inspect.isclass(
            origin  # pyright: ignore[reportUnknownArgumentType]
        ) and issubclass(origin, httpx.Response):
            # Because of the invariance of our ResponseT TypeVar, users can subclass httpx.Response
            # and pass that class to our request functions. We cannot change the variance to be either
            # covariant or contravariant as that makes our usage of ResponseT illegal. We could construct
            # the response class ourselves but that is something that should be supported directly in httpx
            # as it would be easy to incorrectly construct the Response object due to the multitude of arguments.
            if cast_to != httpx.Response:
                raise ValueError(f"Subclasses of httpx.Response cannot be passed to `cast_to`")
            return cast(R, response)

        if (
            inspect.isclass(
                origin  # pyright: ignore[reportUnknownArgumentType]
            )
            and not issubclass(origin, BaseModel)
            and issubclass(origin, pydantic.BaseModel)
        ):
            raise TypeError("Pydantic models must subclass our base model type, e.g. `from anthropic import BaseModel`")

        if (
            cast_to is not object
            and not origin is list
            and not origin is dict
            and not origin is Union
            and not issubclass(origin, BaseModel)
        ):
            raise RuntimeError(
                f"Unsupported type, expected {cast_to} to be a subclass of {BaseModel}, {dict}, {list}, {Union}, {NoneType}, {str} or {httpx.Response}."
            )

        # split is required to handle cases where additional information is included
        # in the response, e.g. application/json; charset=utf-8
        content_type, *_ = response.headers.get("content-type", "*").split(";")
        if not content_type.endswith("json"):
            if is_basemodel(cast_to):
                try:
                    data = response.json()
                except Exception as exc:
                    log.debug("Could not read JSON from response data due to %s - %s", type(exc), exc)
                else:
                    return self._client._process_response_data(
                        data=data,
                        cast_to=cast_to,  # type: ignore
                        response=response,
                    )

            if self._client._strict_response_validation:
                raise APIResponseValidationError(
                    response=response,
                    message=f"Expected Content-Type response header to be `application/json` but received `{content_type}` instead.",
                    body=response.text,
                )

            # If the API responds with content that isn't JSON then we just return
            # the (decoded) text without performing any parsing so that you can still
            # handle the response however you need to.
            return response.text  # type: ignore

        data = response.json()

        return self._client._process_response_data(
            data=data,
            cast_to=cast_to,  # type: ignore
            response=response,
        )
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