Their Composer 2 model is Kimi (an open model) with additional RL fine-tuning, for whatever that information is worth to you: https://techcrunch.com/2026/03/22/cursor-admits-its-new-codi...
replyOh, I see.
replyThough, in fairness, that's probably the important part. Like a base model plus "coding smarts" is probably perfect for the situation.
But maybe not as much value as I was thinking.
They have a 'proprietary' model which is just an open source (kimi?) fine tune
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