Tesla shares climbed over 9% on Monday following the company’s long-promised debut of its driverless robotaxi service in Austin, Texas, over the weekend.

The steep jump in Tesla stock was in stark contrast to the broader market, which was trading mostly flat amid geopolitical tensions.

The electric vehicle maker launched the autonomous ride-hailing service on Sunday for a small group of invited users, charging a flat fee of $4.20 per ride.

The launch marks a critical step toward Tesla CEO Elon Musk’s long-standing goal of deploying a commercial self-driving fleet.

In a post on X (formerly Twitter), Musk praised Tesla’s AI software and chip design teams, describing the launch as the “culmination of a decade of hard work.”

“Super congratulations to the @Tesla_AI software & chip design teams on a successful @Robotaxi launch!!” Musk wrote. “Both the AI chip and software teams were built from scratch within Tesla.”