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\"AI builds AI\" - U.S.-China self-improvement race reignites \"AI extinction\" theory

The U.S.-China AI rivalry is moving toward using AI to build stronger AI, with companies focusing on coding, experiment design and training methods to boost next-generation models. The long-term goal is recursive self-improvement, in which AI produces improved successor models in a feedback loop. OpenAI, Anthropic and Google DeepMind cite progress, while analysts say the United States leads in AI-based independent research. Researchers and officials warn safety risks are rising, but neither country has publicly demonstrated fully autonomous recursive self-improvement.