We tried out DeepSeek. It worked well, until we asked it about Tiananmen Square and Taiwan

The AI app soared up the Apple charts and rocked US stocks, but the Chinese chatbot was reluctant to discuss sensitive questions about China and its government

The launch of a new chatbot by Chinese artificial intelligence firm DeepSeek triggered a plunge in US tech stocks as it appeared to perform as well as OpenAI's ChatGPT and other AI models, but using fewer resources.

By Monday, DeepSeek's AI assistant had rapidly overtaken ChatGPT as the most popular free app in Apple's US and UK app stores. Despite its popularity with international users, the app appears to censor answers to sensitive questions about China and its government.

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