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AI models whose weights are publicly released, enabling anyone to download, run, fine-tune, and deploy them. The open-source AI movement — led by Meta's Llama, DeepSeek, and Stability AI — has democratized access to frontier-class capabilities. Open models run on consumer hardware, allow data sovereignty, and spawn vibrant ecosystems of community-built fine-tunes. The tension between open and closed approaches remains one of the defining debates in AI development.