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Cursor unveils new AI coding model Composer 2 based on Moonshot AI\'s Kimi

AI coding company Cursor launched a new model, Composer 2, promoting it as delivering frontier-level coding intelligence. It later emerged that the model partially used an open-source AI model provided by Chinese AI company Moonshot AI, Kimi. A user on X alleged Composer 2 was essentially Kimi 2.5 with reinforcement learning added, and a Cursor executive acknowledged it started from an open-source base. Cursor said only about a quarter of final compute came from Kimi 2.5.