The Tesla boss unveiled upgraded versions of Optimus at Robotaxi Day and predicted the robots will be "the biggest product ever of any kind."

You could fall asleep and wake up at your destination,” said Mr. Musk, Tesla’s C.E.O., but some experts are skeptical that such cars will be ferrying passengers soon.

Tesla unveiled its long-awaited robotaxi at a Hollywood studio Thursday night, though fans of the electric vehicle maker will have to wait until at least 2026 before they are available.