SAN FRANCISCO—General Motors Co.’s autonomous car unit, Cruise, revealed a toaster-shaped robot taxi that it says will be cheaper than taking a human-driven ride-hailing service or driving a car.

Cruise Chief Executive Dan Ammann on Tuesday said the all-electric vehicle, called Cruise Origin, was more than a futuristic vision. “A lot of times, people show these kinds of concept cars and it’s just a thing and maybe it will happen and maybe it won’t,” he told reporters, after taking the stage to reveal the vehicle before hundreds…

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