Elon Musk Unveils Humanoid Robot Optimus at Tesla’s AI Day

Elon Musk showed off a new humanoid robot Friday at a Tesla artificial intelligence event, part of the chief executive’s effort to shape public perception of the company as more than an electric-vehicle maker.

Mr. Musk first laid out the vision for the robot, called Optimus, a little more than a year ago at Tesla’s first-ever AI day. At the time, a dancer in a costume appeared onstage. This time, Mr. Musk presented a prototype at the gathering that unfolded late Friday in Palo Alto, Calif.