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OpenAI on Monday said it raised $40 billion in a new funding round that valued the ChatGPT maker at $300 billion, the biggest capital-raising session ever for a startup.

Hype is growing from leaders of major AI companies that "strong" computer intelligence will imminently outstrip humans, but many researchers in the field see the claims as marketing spin.

A powerful new AI tool Manus is making waves in China, fuelling hopes that it could replicate the success of DeepSeek, which earlier this year rattled the global tech industry with its state-of-the-art chatbot.

Artificial intelligence developer OpenAI is "not for sale", chief executive Sam Altman said in Paris Tuesday in response to a reported $97.4 billion bid from competitor Elon Musk.

Global experts began debating the threats and promise of artificial intelligence (AI) at a gathering in Paris on Thursday and Friday, ahead of a summit of world leaders on the fast-moving technology.

The emergence of the DeepSeek chatbot has sent Silicon Valley into a frenzy, with calls to go faster on advancing artificial intelligence and beat communist-led China before it is too late. 

China-based DeepSeek's artificial intelligence model has shaken the sector by offering high performance apparently at a fraction of the cost of those developed by US giants, with many experts saying the release also hints at opportunity for investment minnow Europe.