Building Cursor Composer - Infrastructure, Training, and Evaluations for AI Coding Models

Explore the technical architecture and development process behind Cursor Composer, the first coding model from Cursor, in this 16-minute conference talk. Discover the critical "fast vs. smart" trade-offs that shaped the system's design and learn how the team approached complex scaling challenges including consistency and burstiness issues. Examine the infrastructure solutions and custom kernels developed to support the platform, and understand how cloud agents and training infrastructure were co-designed for optimal performance. Delve into the implementation of semantic search capabilities and analyze the results achieved in terms of parallelism and agent behavior. Gain insights from key reflections on the development process and understand the practical implications through the "airplane Wi-Fi" analogy that illustrates the system's performance characteristics.