src/anthropic/_client.py [84:114]:
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        _strict_response_validation: bool = False,
    ) -> None:
        """Construct a new synchronous Anthropic client instance.

        This automatically infers the following arguments from their corresponding environment variables if they are not provided:
        - `api_key` from `ANTHROPIC_API_KEY`
        - `auth_token` from `ANTHROPIC_AUTH_TOKEN`
        """
        if api_key is None:
            api_key = os.environ.get("ANTHROPIC_API_KEY")
        self.api_key = api_key

        if auth_token is None:
            auth_token = os.environ.get("ANTHROPIC_AUTH_TOKEN")
        self.auth_token = auth_token

        if base_url is None:
            base_url = os.environ.get("ANTHROPIC_BASE_URL")
        if base_url is None:
            base_url = f"https://api.anthropic.com"

        super().__init__(
            version=__version__,
            base_url=base_url,
            max_retries=max_retries,
            timeout=timeout,
            http_client=http_client,
            custom_headers=default_headers,
            custom_query=default_query,
            _strict_response_validation=_strict_response_validation,
        )
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src/anthropic/_client.py [324:354]:
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        _strict_response_validation: bool = False,
    ) -> None:
        """Construct a new async AsyncAnthropic client instance.

        This automatically infers the following arguments from their corresponding environment variables if they are not provided:
        - `api_key` from `ANTHROPIC_API_KEY`
        - `auth_token` from `ANTHROPIC_AUTH_TOKEN`
        """
        if api_key is None:
            api_key = os.environ.get("ANTHROPIC_API_KEY")
        self.api_key = api_key

        if auth_token is None:
            auth_token = os.environ.get("ANTHROPIC_AUTH_TOKEN")
        self.auth_token = auth_token

        if base_url is None:
            base_url = os.environ.get("ANTHROPIC_BASE_URL")
        if base_url is None:
            base_url = f"https://api.anthropic.com"

        super().__init__(
            version=__version__,
            base_url=base_url,
            max_retries=max_retries,
            timeout=timeout,
            http_client=http_client,
            custom_headers=default_headers,
            custom_query=default_query,
            _strict_response_validation=_strict_response_validation,
        )
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