Cursor Releases Composer 2.5: AI Coding Assistant with Improved Intelligence and Long-Task Performance

Summary

Composer 2.5 is a major update to the AI-powered coding assistant available in Cursor. It delivers substantial improvements in intelligence, behavior, and reliability over its predecessor, particularly for long-running, complex tasks. The improvements were achieved through scaled training, more complex reinforcement learning environments, and new learning methods. The model also features better communication style and effort calibration, though these behavioral improvements are not well captured by existing benchmarks.