DeepSeek is an AI assistant which appears to have fared very well in tests against some more established AI models developed in the US, causing alarm in some areas over not just how advanced it is, but how quickly and cost effectively it was produced.

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Individual companies from within the American stock markets have been even harder-hit by sell-offs in pre-market trading, with Microsoft down more than six per cent, Amazon more than five per cent lower and Nvidia down more than 12 per cent.