ISTANBUL   US tech giants OpenAI, Oracle and SoftBank are teaming up to establish a venture which will invest up to $500 billion in artificial intelligence infrastructure in the US, OpenAI announced on Wednesday. On X, Chatgpt creator OpenAI said they will begin investing $100 billion immediately in the project, called Stargate, adding: "This infrastructure will secure American leadership in AI, create hundreds of thousands of American jobs, and generate massive economic benefit for the entire