OpenAI is close to finalizing a $40 billion funding round led by SoftBank Group.Investors in the funding round include Magnetar Capital, Coatue Management, Founders Fund, and Altimeter Capital Management.The funding round would be the largest of all time, valuing OpenAI at $300 billion.SoftBank will invest an initial $7.5 billion, with a second tranche of $30 billion to follow.