CircleCI's Smarter Testing is a new feature designed to enhance software delivery by providing rapid and reliable feedback through intelligent test selection and dynamic test splitting. This innovation addresses productivity challenges posed by long build and test cycles, which can significantly disrupt developer focus and efficiency, especially as AI increases the volume and speed of code changes. Smarter Testing analyzes code diffs, dependency graphs, and historical test behavior to identify and run only the tests that are relevant to the latest code changes, thereby reducing unnecessary test runs by over 90%. It optimizes test distribution across parallel execution nodes, effectively shortening feedback times by up to 97% without compromising quality standards. Language-agnostic and integrated within CircleCI, it eliminates the need for separate services or custom scripts, simplifying the process for teams. By prioritizing critical tests, it enhances the software development cycle, allowing developers to maintain momentum and reduce the occurrence of flaky failures and false alarms. Currently available in closed preview, Smarter Testing is part of CircleCI's broader initiative to shift CI/CD from a reactive to a proactive process, aligning with the demands of rapid iteration in the AI era.