Building Cursor Composer – Lee Robinson, Cursor

Lee Robinson discusses Cursor Composer, a model designed for real-world software engineering that balances speed and intelligence. He explains the motivations behind building the model, the challenges faced, and the infrastructure solutions implemented, including custom kernels and load balancing. The talk covers the architecture involving inference, rollout, and environment servers, and emphasizes matching the training environment to the production environment to leverage tools like semantic search. Robinson shares positive results from the release of Composer in Cursor 2.0, highlighting its impact on coding efficiency and expresses excitement about the potential of reinforcement learning for specialized tasks.