How did a $5.6 million AI model trigger a $589 billion stock market crash?

The answer

On January 27, 2025, Chinese AI startup DeepSeek released its R1 reasoning model, which it claimed was trained for just $5.6 million - a fraction of the $100+ million spent on OpenAI's GPT-4. The announcement triggered the largest single-day market cap loss in stock market history: Nvidia's shares plummeted 17%, erasing $589 billion in value in one day. Investors panicked over the implication that AI might not require the massive GPU investments everyone assumed. DeepSeek R1 used innovative training techniques including mixture-of-experts architecture and reinforcement learning to achieve competitive performance at dramatically lower cost. While some analysts questioned whether the $5.6 million figure excluded prior research costs, the 'DeepSeek shock' fundamentally challenged Silicon Valley's assumption that AI leadership requires unlimited capital.