Seattle-area company Helion Energy gets $425 million from investors including Sam Altman and Softbank to pursue clean energy's "Holy Grail."

A US start-up whose backers include tech billionaires Sam Altman and Peter Thiel has raised $425mn to keep it on track to achieve its target of producing electricity from nuclear fusion in 2028. Helion has the most ambitious timeline among start-ups racing to develop nuclear fusion,

Helion’s nuclear fusion promises have garnered the attention of Silicon Valley—and raised concerns amongst scientists wary of its aggressive timeline.

OpenAI CEO Sam Altman has publicly applauded competitor DeepSeek’s R1 model in a recent social media post.

The sources said Altman has scheduled his trip to New Delhi for Feb. 5. One of the sources said a meeting with government officials was also on the cards. But the schedule is not finalised and his plans could still change,