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Co-founders of Musk’s xAI join exodus from start-up’s tech team

Jimmy Ba will be the sixth member of the founding team to depart

Interviews underway as US president tries to fill role

Philanthropic group’s staff express concern about the impact of chair’s ties to disgraced financier after 2008 conviction

Germany explores joining France’s nuclear umbrella as European fears grow over the US reducing its military footprint

The flap of an AI paper triggers a freight-ening sell-off

Lucy Fisher talks to Miranda Green, Stephen Bush and Chris Smyth

USS Gerald R Ford will join 10 ships in the region as White House also holds negotiations with senior Iranian officials

How the Trump administration could determine who owns a media giant

OpenAI is rolling out advertising on ChatGPT to select users. Experts say others will almost certainly follow suit

US secretary of state cancels attendance at last minute in move that EU official calls ‘insane’

Can capitalism survive the curbing of appetites?

Ban remains in effect even though judges find the UK government’s proscription of the group was unlawful

Nation ranks behind US as worst in G7 on emissions progress as Mark Carney weakens environmental goals

Optimism in Japan following Sanae Takaichi’s election win is running high

Data group’s share price has fallen in recent months

The secretary of state has gone from presidential rival to loyal lieutenant amid a foreign policy blitz

Our experts discuss which companies to buy, sell or hold this week

The normal order of what influences the world’s most important reserve currency is breaking down

Labour failure is no guarantee of Conservative success

Jack Nicholls’s debut brings a grimly comical parable about human nature to London’s Royal Court

Head of Wall Street bank calls attorney a ‘tremendous’ person hours after she quit over links to Jeffrey Epstein

The cultural complex’s national importance has belatedly been recognised

The companies are among a number the Pentagon believes could pose a threat to American national security

Up-to-date deals from banks and building societies