lee robinson cursor - Cursor Confirms Kimi K2.5 as Base Model; Moonshot Affirms Commercial Authorization
According to 1M AI News monitoring, the official account @Kimi_Moonshot of Moonshot AI posted to congratulate the release of Composer 2, stating: “Cursor accesses Kimi K2.5 via Fireworks AI’s RL and inference platform under an authorized commercial partnership.”Following Kimi's official statement, Cursor co-founder Aman Sanger and Vice President of Developer Education Lee Robinson publicly confirmed the base model's origin and disclosed additional technical details. Sanger stated that the team evaluated multiple base models using perplexity metrics, and Kimi K2.5 "proved to be the strongest," after which they applied continued pre-training and four times the computational scale of reinforcement learning, deploying the model via Fireworks AI’s inference and RL sampler. Robinson added that approximately one-quarter of the computational effort in the final model came from the base model, while the remaining three-quarters originated from Cursor’s own training. Robinson cited Kimi’s official tweet, confirming that Moonshot AI has verified compliance with licensing requirements.
Sanger and Robinson both acknowledged that failing to mention the Kimi base model in the blog post was "a mistake," and stated that the base model source will be clearly noted at the time of the next model's release.
Previous related controversies quickly spread on social media, and Elon Musk further amplified the topic's熱度 by replying to @fynnso's post with "Yeah, it's Kimi 2.5".