Cursor Acknowledges Kimi K2.5 as Composer 2 Base After Developer Spots Model ID

Cursor, the AI coding platform valued at $29.3 billion, publicly acknowledged on March 20 that its new Composer 2 model started from Moonshot AI's open-weight Kimi K2.5. The acknowledgment came less than 24 hours after the company launched Composer 2 without disclosing the base model, and only after a developer intercepted the model ID kimi-k2p5-rl-0317-s515-fast in API traffic. Moonshot AI's head of pretraining questioned Cursor's license compliance and payment of fees in a post he later deleted. Hours later, Moonshot's official account issued a congratulatory statement confirming an "authorized commercial partnership."

Maria Garcia

Los Angeles

Bilingual tech journalist slicing through AI noise at implicator.ai. Decodes digital culture with a ruthless Gen Z lens—fast, sharp, relentlessly curious. Bridges Silicon Valley's marble boardrooms, hunting who tech really serves.