On March 19, 2026, Cursor announced Composer 2, the latest version of its in‑house coding model. The benchmarks were impressive: 61.7% on Terminal‑Bench 2.0, beating Anthropic’s Claude Opus 4.6 (58.0%) while costing one‑tenth the price. Developers celebrated another leap in AI‑powered software development. Within 24 hours, the celebration turned into a heated debate. A developer discovered the model ID in Cursor’s API configuration: kimi-k2p5-rl-0317-s515-fast – literally “Kimi 2.5 plus reinforcement learning.” Elon Musk chimed in: “Yeah, it’s Kimi 2.5.” Suddenly, the story wasn’t about a breakthrough – it was about transparency, licensing, and the quiet rise of Chinese open‑source AI. submitted by /u/Remarkable-Dark2840
Originally posted by u/Remarkable-Dark2840 on r/ArtificialInteligence