Cursor's Composer 2 model was revealed to be fine-tuned from Kimi K2.5, a model by Moonshot AI.
According to GeekPark, Cursor released its self-developed model Composer 2 on March 19, claiming it derives from 'our first continued pretraining run' and scored higher than Claude Opus 4.6 on benchmarks. The underlying base is Kimi K2.5, an open-source model from Kimi, with Cursor stating about 25% of Composer 2’s pretraining came from K2.5, and Cloudflare reporting 77% cost savings after deploying K2.5 on its Workers AI platform. The report also notes K2.5’s strong programming benchmarks and mentions notable attention from Elon Musk and other figures around the Starters, including demonstrations at CES and GTC with NVIDIA.”According to GeekPark, the article also highlights pricing for Composer 2 and asserts that K2.5 enables lower-cost, high-performance inference, and that Kimi’s Attention Residuals work is part of the underlying technological advancements.
Key facts
- 01Composer 2 released on March 19 by Cursor; official blog states it stems from 'our first continued pretraining run' and its Bench scores (SWE-bench 61.3; Multilingual 73.7) surpass Claude Opus 4.6 (58.2).
- 02About 25% of Composer 2’s pretraining comes from K2.5.
- 0377% cost reduction when running K2.5 on Workers AI, from higher-cost previous models.
- 04K2.5 deployed on Cloudflare's global edge platform; NVIDIA demonstrates Kimi at CES/GTC; Chamath Palihapitiya comments on K2.5’s impact on cost and AI scaling.
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