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Unexpected move set to deepen rifts after board sacks artificial intelligence company’s co-founder

ChatGPT-maker aims for big boost from new AI products, Apple partnership and infrastructure investment

Microsoft-backed group unveils prototype search tool, targeting rival’s $175bn-a-year search business

Satya Nadella’s bet on AI start-up destabilised by shock sacking of Sam Altman

Although Microsoft extended its partnership with the chatbot creator, the two companies are also competitors

Plus, the battle over the world’s biggest zinc smelter and a look at Carl Icahn’s rigid confidentiality agreements

The chaos around his near reinstatement and subsequent replacement will give investors pause

Entrepreneur seeks to meet growing need for semiconductors while scaling back reliance on Nvidia

More than 95% of employees have threatened to quit and join Microsoft if board refuses to resign