Tech Mar 21, 2026 4 min Cursor Composer 2 turned out to be Kimi K2.5 with coding-focused RL Cursor released Composer 2 without disclosing its base model; calling its OpenAI-compatible API revealed it is Kimi K2.5. This escalated into a licensing dispute, but a formal commercial agreement with Moonshot AI was subsequently confirmed. Cursor Kimi Moonshot AI reinforcement learning LLM open weights
