Cursor Ships Composer 2.5 — In-House Model Built on Kimi K2.5 Matches Opus 4.7 at 1/10th the Cost

Cursor Blog·high signal

Cursor released Composer 2.5 on May 18, a coding model fine-tuned on Moonshot AI's open-weight Kimi K2.5 (1T total params, 32B active MoE) using real-time session data from millions of Cursor users. It hits 79.8% on SWE-Bench Multilingual — matching Opus 4.7 — while pricing at $0.50/M input tokens vs. $15 for frontier models. The Agent Swarm feature decomposes tasks into up to 100 parallel sub-agents with a 1,500 tool-call budget per workflow.