Cursor Composer 2: The Kimi K2.5 Controversy and...

Originally published at heyuan110.com On March 19, Cursor shipped Composer 2 with a triumphant blog post. Three days later, a developer found kimi-k2p5-rl-0317-s515-fast in the API config. That single string unraveled a story about transparency, open-source ethics, and the global nature of AI infrastructure. Key findings: Composer 2 is built on Moonshot AI's Kimi K2.5 (Chinese open-source MoE model) Cursor's "75% of compute was ours" defense doesn't hold up CursorBench scores (61.3) are home-fie