Footage posted by YouTube user nbkagzw13 (above) shows a prototype version of the Model X, wearing minimal camouflage, while on a public road in Silicon Valley.
Unlike a video posted earlier this year, which captured a heavily disguised Model X undergoing testing near a skate park close to San Francisco, this Model X only has a few design elements blotted out with white tape.
The Model X made its debut as a concept car back in early 2012. It grabbed many a headline thanks to its electric drivetrain and dramatic top-hinged "falcon wing" rear doors.
Compared to the concept car, the prototype features revised side window shapes, a working wing mirror borrowed from the Model S sedan, and redesigned front and rear bumpers.
The Model X's on-sale date has been pushed back several times. Last year, Elon Musk, Tesla's outspoken CEO, stated that the Model X would be available from the third quarter of 2015.
The Model X is expected to feature the same rear- and all-wheel drivetrains as the Model S.
Within the next few weeks the Model S should receive software update 6.2, which will equip existing and future vehicles with improved tools for battling range anxiety, as well as blind spot monitoring, valet mode and automated emergency braking.
Software update 7, which is slated to arrive later this year, will enable the use of automated steering on highways.