There is little doubting the dedication of Mr Sam Altman to OpenAI, the firm at the forefront of an artificial intelligence (AI) revolution. As co-founder and boss he appeared to work as tirelessly for its success as at a previous start-up where his single-mindedness led to a bout of scurvy, a disease more commonly associated with mariners of a bygone era who remained too long at sea without access to fresh food.

So his sudden sacking on Nov 17 was a shock. The reasons why the firm’s board lost confidence in Mr Altman are unclear. Rumours point to disquiet about his side projects, and fears that he was moving too quickly to expand OpenAI’s commercial offerings without considering the safety implications, in a firm that has also pledged to develop the tech for the “maximal benefit of humanity”.