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Open-source AI models rise globally as U.S. companies join in

Open-source AI models are moving from challengers to the mainstream in the global AI industry. Chinese companies such as DeepSeek, Z.ai and Moonshot AI are releasing open-weight models, and U.S. firms are also joining the trend, putting pressure on closed-model leaders OpenAI and Anthropic. Moonshot AI unveiled its Kimi K3 model, while U.S. startup Thinking Machines Lab introduced its first model as open-weight. The shift is also influencing stock markets and corporate strategies.