Composer 2.5
Cursor · 2026-05-18
Composer 2.5 is Cursor's proprietary multimodal agentic coding model, released May 18, 2026, and built on Moonshot's open-weight Kimi K2.5 mixture-of-experts checkpoint. Cursor continued pretraining with Muon and added reinforcement learning, including targeted textual feedback; Cursor says 85% of the model's compute went to additional training and RL, and Composer 2.5 used 25× more synthetic tasks than Composer 2. It accepts text and image input, uses adaptive effort calibration, and is designed for long-horizon coding in Cursor.