A consortium of investors led by Elon Musk offered $97.4bn to take over OpenAI, the maker of ChatGPT.

The billionaire’s attorney, Marc Toberoff, confirmed he submitted the bid for “all assets” of the tech company to its board on Monday.

The offer is the latest twist in a longstanding battle between Musk, the world’s richest man and right hand to US President Donald Trump, and Open AI chief executive Sam Altman over the future of the start-up at the centre of the AI boom.

In response to the bid, Altman posted o