Cursor admits using Chinese AI model for new product after Elon Musk's post

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".