Clarifai has introduced API Keys as a new authentication method to provide developers with greater flexibility and control when building applications using their API. This method allows for the inclusion of scopes, enabling keys to perform specific API calls, such as 'Predict' or 'Search', without the ability to alter an application, thereby enhancing security, especially in client-side applications like browsers or mobile apps. The transition from the previous OAuth2 client credentials method to API Keys is designed to offer more power and security, allowing developers to create and manage custom models with ease while protecting their applications from potential reverse engineering threats. Although the change marks a significant shift in interaction, Clarifai will continue to support both authentication methods until late 2017, after which Access Tokens will be deprecated in favor of API Keys, ensuring a smoother transition for developers.