The object that created the Moon by colliding with the Earth might also have been its neighbour, researchers suggest

Departure comes amid increasing concerns that AI industry could be in a bubble

Tool could let multiple people decide where they will go to eat, creator OpenAI suggests

‘About’ tool lets people give quick updates on their lives

Object is just the third known visitor from another solar system – and has prompted speculation about whether it might be an alien spacecraft

Company says it will also try harder to identify videos made with artificial intelligence

ChatGPT, X and many other major websites were taken offline by one file