A SpaceX Falcon Heavy rocket lifts off from historic launchpad 39-A at the Kennedy Space Center in Cape Canaveral, Florida, on Feb. 6, 2018.

SpaceX is even ahead of the rest of the space industry than previously thought, according to CEO Elon Musk, who claimed on Monday that a "fully expendable" Falcon Heavy would cost only $150 million.

That's about $250 million cheaper than the closest competition.

The company's Falcon Heavy rocket became the world's most powerful commercial rocket after SpaceX successfully completed its first launch on Tuesday.

SpaceX had said the cost of each Falcon Heavy launch starts at $90 million. But that price tag — a fraction of the cost of the next biggest rockets from competitors United Launch Alliance (ULA) and Arianespace — was a best-case scenario. It was unclear how much above the $90 million price tag a fully expendable version of Falcon Heavy would cost.