Moonshot AI Kimi K3: Largest Open-Source AI Model Launched

China's Moonshot AI has introduced Kimi K3, which is now the largest open-source AI model. It features a reported 2.8 trillion parameters. Developed in Beijing, Kimi K3 uses the Kimi Delta Attention framework and includes native visual understanding. What's interesting is that while the open weights aren't fully available yet, you can access the model through Moonshot's apps and API. The complete release is expected later in July 2026. This new model is sparking discussions about its potential to challenge existing leaders like OpenAI and Anthropic. It performs strongly on coding and agentic benchmarks, placing it in the competitive frontier pack. However, in prediction markets for the best AI model by the end of August 2026, Anthropic holds a dominant 92% YES probability, while Moonshot AI has a marginal 1% YES probability. The upcoming full release of Kimi K3's open weights will be a key factor in its adoption and influence. This matters because it shows the ongoing race and competition in the rapidly evolving AI landscape.