Moonshot AI unveils world’s largest open-source AI model as China narrows gap with US rivals

Chinese start-up Moonshot AI has launched the world’s largest open-source artificial intelligence model, claiming to outperform leading US systems from Anthropic and OpenAI in some capabilities, as domestic developers race to challenge American dominance. Beijing-based Moonshot said its Kimi K3, unveiled late on Thursday, had achieved “open frontier intelligence” with 2.8 trillion parameters, which was significantly larger than previous open models from Chinese competitors, including DeepSeek’s.