The funding round would increase Perplexity's valuation by more than 50 per cent from its previous financing a year ago, according to The Information, which cited people with knowledge of the discussion.
Perplexity's annualised revenue has risen to more than $US750 million ($A1 billion) from less than $US250 million ($A349 million) at the start of the year, the report said.
Part of the revenue growth has been driven by Perplexity Computer, a cloud-based AI agent used by professionals to automate computer-based tasks, the report added, citing people familiar with the matter.
Perplexity declined to comment on the Information report, while Nvidia did not immediately respond to a request for comment.
The Information reported in September last year that Perplexity had finalised a $US20 billion ($A28 billion) valuation.
Earlier this year, Perplexity signed a $US750 million ($A1 billion) agreement with Microsoft to use its Azure cloud service, according to a Bloomberg News report.
Perplexity is planning to go public in 2028 regardless of how the market receives the listings of Anthropic and OpenAI, CEO Aravind Srinivas told CNBC in an interview in June.
The startup's high-profile backers, along with Nvidia, include Amazon founder Jeff Bezos and Japan's SoftBank Group.
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