U.S. Agency Says DeepSeek Copied Top U.S. AI to Build Its Own

On Sept. 8, 2026, U.S. safety agency CISA said in notice AA26-251A that DeepSeek has since at least late 2024 systematically copied answers from America’s best AI systems to train its own, like copying homework. I’m doubtful about cost predictions: if mass copying works, heavy spending on training buys less safety.