This episode explores the challenges and opportunities of benchmarking AI agents on full-stack coding tasks. Against the backdrop of advancements in AI like AlphaGo, the conversation highlights the underdeveloped nature of trajectory management in AI coding. More significantly, the discussion centers on a new benchmark, "Fullstack Bench," developed to evaluate AI's ability to complete full-stack application development, from front-end to back-end, including database and API integration. For instance, the benchmark assesses the AI's capacity to handle complex tasks like implementing a file manager app with hierarchical authorization. The hosts delve into the importance of strong guardrails, such as type safety, in improving AI coding performance and reducing variance in outputs. In contrast to existing benchmarks, Fullstack Bench addresses the gap in evaluating real-world application development scenarios. This means for developers building AI-powered applications, the benchmark provides a rigorous framework for evaluating model performance and improving the user experience.