SoftBank has invested an additional $10 billion in OpenAI, bringing its cumulative investment in the U.S. artificial intelligence startup to $64.6 billion and its ownership stake to about 13%. SoftBank Group said Oct. 1 that the investment was made through SoftBank Vision Fund 2. It marked the third follow-on investment in OpenAI and completed the previously announced $30 billion follow-on commitment. The investment was funded with proceeds from foreign-currency-denominated senior notes issued late last month. SoftBank also said on Sept. 30 that it canceled the remaining undrawn $10 billion portion of a $40 billion bridge loan for OpenAI and fully repaid all related borrowings, following the cancellation and an early repayment announced last month.