By 2040, there will be at least 10 billion humanoid robots priced between $20,000 and $25,000, Elon Musk said at the 8th Future Investment Initiative conference, which began Tuesday in Saudi Arabia’s capital, Riyadh.

The Optimus robot is the humanoid robot under development by Tesla and could multiply the company’s valuation, according to Musk, who joined the conference via videolink.

“Robotic taxis makes Tesla about a $5 trillion company,” Musk said. “The Optimus Robot, I think, makes Tesla a $25 trillion company.”

Musk also spoke about population decline, the need for “maximally truth seeking” artificial intelligence, and timing for sending space ships to Mars.

He said he believed instead some AIs were being trained to be politically correct, with some being built with a “woke, nihilistic, in my opinion, philosophy.”