OpenAI co-founder Ilya Sutskever is raising more than $1 billion for his startup at a valuation of over $30 billion, according to a person familiar with the matter — vaulting the nascent venture into the ranks of the world’s most valuable private technology companies.Greenoaks Capital Partners, a San Francisco-based venture capital firm, is leading the deal for the startup, Safe Superintelligence, and plans to invest $500 million, said the person, who asked not to be identified discussing privat...