The source is a transcript from a YouTube video by Nathan Lambert summarizing his talk at the PieTorch conference, which provided a recap and reflection on open models in 2025, particularly following the impact of DeepSeek. Lambert, who trains open models at the Allen Institute for AI, discusses the shift in the open model ecosystem, highlighting the rise of Chinese labs like Quen and DeepSeek, which have begun to surpass Western models like Llama in adoption metrics. The discussion also touches on the geopolitical context, contrasting the open strategies of Chinese companies with the more cautious approach of US tech firms, while also advocating for continued investment in fully open-source models for research and innovation.

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