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Cursor quietly built its new coding model on top of Chinese open-source Kimi K2.5

Summary by The-decoder.com
Cursor releases Composer 2, the second generation of its own AI model for software development. The model is designed to keep pace with the leading coding models from Anthropic and OpenAI at significantly lower costs. The article Cursor quietly built its new coding model on top of Chinese open-source Kimi K2.5 appeared first on The Decoder.
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Cursor releases with Composer 2 the second generation of its own AI model for software development. The model should keep up with the leading coding models of Anthropic and OpenAI at significantly lower costs. The article Cursor's new coding model is based on Kimi K2.5 - Founder admits errors a first appeared on The Decoder.

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Cursor recently launched its new Composer 2 model, claiming it to be a self-developed, programmed model that emphasizes the combination of "continuous pre-training" and "reinforcement learning." However, less than 24 hours after the model's release, developer @fynnso discovered while testing the API on the social media platform X that the relevant internal model number was "kimi-k2p5-rl-0317-s515-fast," directly revealing that Composer 2's under…

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winandmac.com broke the news in on Saturday, March 21, 2026.
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