Perplexity AI closed its Series D round in December 2024 at a $10 billion valuation, with SoftBank leading the charge. That’s a more than threefold jump from the $3 billion Series C valuation the company carried just a year earlier — the kind of trajectory that makes VCs write checks and skeptics reach for spreadsheets.
The round adds to a total funding base that had already crossed $500 million before Series D, and it plants Perplexity firmly in the tier of AI startups that are being treated less like products and more like infrastructure bets. SoftBank’s involvement isn’t just a capital move — it’s a statement. The Japanese conglomerate has a well-documented appetite for moonshots, and backing an AI search challenger to Google fits that playbook exactly.
Perplexity was founded by Aravind Srinivas, a former OpenAI researcher, with a simple but audacious premise: replace the ten blue links with a conversational answer that actually cites its sources. It sounds obvious in hindsight, but executing it at scale is the hard part. By 2024, the company was reporting over one billion monthly queries — a number that gives the product real legitimacy beyond the AI-curious early adopter crowd.
The competitive picture is genuinely interesting. Google has Gemini baked into Search. OpenAI has ChatGPT with browsing. Yet Perplexity has carved out a user base that keeps coming back specifically for the search-first, citation-heavy experience. That’s not nothing. When Srinivas announced the round, he framed SoftBank’s partnership as part of a longer push toward billions of users worldwide — a goal that requires both capital and infrastructure at a scale that justifies a $10 billion price tag, at least in theory.
“We’re grateful for SoftBank’s partnership as we scale Perplexity to serve billions of users worldwide.” — Aravind Srinivas, CEO, Perplexity AI (Series D announcement, December 2024)
Going from $3 billion to $10 billion in roughly twelve months is the kind of number that sounds great in a press release and slightly terrifying in a board deck. At this valuation, Perplexity needs to either demonstrate a credible path to significant revenue or keep growing fast enough that future investors accept the baton. The company has a Pro subscription tier and has been experimenting with advertising — both reasonable monetization levers, neither of them proven at the scale implied by a $10 billion price tag.
The working title of this article referenced a $400 million quarterly burn rate and an 18-month runway from leaked financials. Those specific figures don’t have a verified public source — no authenticated company filing, no confirmed leak, no credible financial outlet has put hard numbers on Perplexity’s operational costs. Publishing unverified burn figures as fact would be exactly the kind of thing that sounds dramatic and turns out to be wrong, so they’re not here. What is fair to say: AI search is expensive to run. Inference costs, infrastructure, and aggressive hiring in a competitive talent market don’t come cheap. The pressure to convert user growth into revenue before the next raise is real, regardless of the exact dollar figure on the burn line.
SoftBank has had its disasters — WeWork being the most spectacular — but the firm’s thesis on AI infrastructure is more grounded than its real estate detours. Search is a multi-hundred-billion-dollar market that hasn’t seen a serious structural challenger since Google consolidated dominance two decades ago. If AI genuinely changes how people find and process information, the incumbent’s advantage shrinks. Perplexity is the most focused pure-play bet on that shift among funded AI startups right now. That’s the logic SoftBank is buying into, and at $10 billion, they’re not the only ones.
The Series D buys Perplexity time and credibility, but the next eighteen months will be clarifying. The company needs to show that its monetization strategy — subscriptions, advertising, or something else entirely — can scale alongside its query volume. SoftBank’s involvement raises the stakes: a firm that size doesn’t lead rounds to watch startups meander. Expect product expansion, possible enterprise moves, and a louder fight for the users currently defaulting to ChatGPT or Google AI Overviews. The $10 billion valuation is the opening bid. The actual test is what comes next.
