China's Kimi K3 Becomes Largest Open-Source AI Model

Beijing-based Moonshot AI has released Kimi K3, a 2.8-trillion-parameter model it claims is the largest open-source AI in the world. Benchmarks show it rivals top proprietary systems from Anthropic and OpenAI, marking a major escalation in the global AI race. The launch, timed ahead of the 2026 World AI Conference in Shanghai, signals a strong comeback for Moonshot AI after losing ground to DeepSeek. Full model weights are set for release on July 27, and the model is already accessible to the public at kimi.com.