Jeff Dean, who resigned as chief scientist from Google last month, is raising again for his new AI startup, Discovery Loop, this time seeking a valuation of around $50 billion, according to people familiar with the matter.

It was only a few weeks ago that Discovery Loop was raising $1 billion dollars at around a $10 billion valuation, Business Insider reported. But in this white-hot fundraising market where VCs’ voracious appetite for top AI talent such as Dean is matched only by the enormous expense of building an AI lab, it seems it is never too soon to raise funding again.

A spokesperson for Discovery Loop declined to comment. Dean did not…