On Tuesday, SoftBank, the Japanese financial giant, announced plans to dump all 32 million of its shares in Nvidia, the AI chip maker. The news won’t be the needle that pops the AI bubble, but it did cause enough of a stir to make Nvidia’s shares drop 2% Tuesday morning.  

The bad vibes were muted somewhat by news of what SoftBank says it will do with the proceeds of the sell-off, along with those from the sale of some of its $9.17 billion T-Mobile stake: The firm will double down on another big bet in the AI space—OpenAI.

SoftBank expects to invest $30 billion directly in OpenAI this year, according to its second-quarter financial statement in........

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