SoftBank is close to finalizing a $40 billion primary investment in OpenAI at a $260 billion pre-money valuation, sources told CNBC's David Faber.SoftBank would pay out the funding, which would mean a $300 billion post-money valuation for OpenAI, over the next 12 to 24 months, with the first payment coming as soon as spring, Faber reported Friday. SoftBank would be able to syndicate as much as $10 billion of the amount.The new funding would mean SoftBank surpasses Microsoft as the artificial int...