Moonshot's Kimi K3: 2.8T Open-Weight Model Tops Code Arena

Moonshot AI released Kimi K3 on July 16, 2026, a 2.8 trillion parameter sparse MoE model that debuted at number one on Arena.ai's Frontend Code Arena with a score of 1,679. The model features a 1 million token context window, native multimodal support, and open weights with OpenAI SDK compatibility. K3 is priced as a frontier model, marking a shift from Moonshot's previous budget-friendly positioning.