Mira Murati doubled the fundraising target for her new AI startup to $2 billion. It could be the largest seed round in history.

Mira Murati, OpenAI’s former chief technology officer, is expanding her fundraising ambitions for Thinking Machines Lab, her hotly anticipated new generative AI company that has been the subject of feverish interest and speculation from investors in Silicon Valley.

The company is raising upward of $2 billion of venture funding, sources familiar with the matter told Business Insider. That is double what Murati was seeking less than two months ago when BI reported…