Kimi· Updated
Moonshot AI confirmed Kimi-k2.5 is the foundation model behind Cursor Composer 2. Cursor applied continued pretraining and high-compute RL training on top of it, with inference hosted via FireworksAI under an authorized commercial partnership.
Kimi-k2.5, its open model, is the foundation powering Cursor Composer 2. Cursor built on Kimi-k2.5 through continued pretraining and high-compute RL training, then deployed it via FireworksAI's hosted RL and inference platform as part of an authorized commercial partnership.This is the open model ecosystem at work — a model released openly gets taken, specialized, and shipped as a competitive product by a third party. Moonshot AI describes this as exactly the kind of collaboration they want to support: external teams taking the open base and pushing it further with domain-specific training compute.
Evaluate Kimi-k2.5 as a foundation for building specialized coding agents — Cursor's deployment of it in a commercial product is a concrete proof point of what targeted continued pretraining and RL training on an open base can produce.
Congrats to the @cursor_ai team on the launch of Composer 2! We are proud to see Kimi-k2.5 provide the foundation. Seeing our model integrated effectively through Cursor's continued pretraining & high-compute RL training is the open model ecosystem we love to support. Note: Cursor accesses Kimi-k2.5 via @FireworksAI_HQ ' hosted RL and inference platform as part of an authorized commercial partnership.
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