US startup Cursor has admitted it used Chinese firm Moonshot AI's Kimi K2.5 model as the base for its new AI model Composer 2, described as "frontier-level at coding". The disclosure came after an X user flagged Composer's model ID, with Elon Musk responding, "Yeah, it's Kimi 2.5." Cursor Co-founder Aman Sanger said not crediting Kimi earlier was a "miss".