Kimi K3 Launch: Chinese AI Stocks Plunge, New Open-Weight Model

Two Chinese AI companies saw their shares plunge significantly following the launch of Kimi K3. This new AI model from Chinese startup Moonshot is a 2.8 trillion-parameter system, described as the world’s largest open-weight AI to date. Here's the thing: Kimi K3 is designed for advanced reasoning and coding, with a large 1 million-token context window. What's special is that its trained weights are freely downloadable, allowing developers to use and customize it. Moonshot claims K3 performs competitively with models like Anthropic's Fable 5 and outperforms Anthropic's Opus 4.8 and OpenAI's GPT-5.5 and GPT-5.6 Sol in GPU kernel optimization. Independent evaluators largely support these claims, with Arena AI ranking K3 first for building web interfaces. This release comes shortly after other frontier models were temporarily pulled from the market, and it triggered a sharp sell-off in shares of rival Chinese AI firms Zhipu and Minimax, which dropped 27.7 percent and 16.5 percent respectively. The bottom line is that this open-weight, high-performing model could significantly impact the global AI landscape.