Musk saw his wealth jump by $178 billion in just two days, putting his year-to-date gain at a record-breaking $216 billion as investors cheered Tesla’s driverless taxi tests in Texas, according to

Elon Musk on Monday became the first person ever worth $600 billion, Forbes said, on the heels of reports that his SpaceX startup was likely to go public at a valuation of $800 billion.

Elon Musk has become the first individual to surpass a net worth of $600 billion, according to Forbes. The achievement not only solidifies his position as the world's richest person but also dramatically widens the wealth gap at the top, outpacing other tech giants and industry leaders.

Tesla CEO Elon Musk became the first person to cross the $700 billion mark in net worth on Friday, after the Delaware Supreme Court reinstated Tesla stock options worth $139 billion that had been voided last year, according to Forbes’ Billionaires Index.

Elon Musk's net worth hits $681 billion, more than double Google co-founder Larry Page's $249 billion wealth, as Tesla's stock surge widens the billionaire gap.

Elon Musk has become the first person to reach an estimated net worth of more than $US600 billion ($A902 billion), according to Forbes magazine.

Elon Musk became the first person worth over $600 billion after SpaceX’s soaring valuation boosted his fortune, while Nigeria’s Dangote and Rabiu also climbed.