In 2024, AI developers have made significant advancements, with AI agents improving from completing 3% to over 50% of the SWE Verified benchmark and potentially reaching 70-90% next year. The focus is shifting from questioning AI's utility in real-world coding environments to enhancing their quality assurance and debugging capabilities. This evolution began with fixing failing browser tests and has progressed towards creating general-purpose AI developers. A pivotal moment was the introduction of "Replay Simulation," which allows deterministic browser sessions to be recorded, replayed, and modified in the cloud, effectively closing the testing loop. Alongside, "Replay Flow" streamlines the debugging process by enabling AI agents to access runtime data more efficiently, reducing the steps needed for problem-solving. Together, these tools are helping AI agents not only fix flaky tests but also address arbitrary bugs and implement new features, marking a transformative step in AI development.