The woman who built PyTorch at Meta just raised $1.5B on a bet that Big Tech shouldn’t own AI — TFN

• Fireworks AI raises $1.505 billion Sequence D at a $17.5 billion valuation, led by Atreides Administration, Index Ventures, and TCV, with NVIDIA, Lightspeed, and Evantic additionally taking part.
• The spherical arrives as the corporate crosses $1 billion in annualised income — up fivefold year-over-year — and each day token quantity grows from 15 trillion to greater than 40 trillion.
• Founder Lin Qiao led over 300 engineers at Meta to construct PyTorch, the open-source framework that now underpins AI improvement at OpenAI, Google, and Meta itself.

When Lin Qiao left Meta in 2022, she walked away from probably the most senior AI engineering roles on the planet. As Senior Director of Engineering, she had spent 7 years — from July 2015 to September 2022 — main over 300 engineers to construct and deploy PyTorch, the open-source framework that now underpins a lot of the AI trade, together with fashions from OpenAI, Google, and Meta itself. She helped construct the plumbing that made the present AI growth potential. Then she left to wager towards it.

The corporate she based, Fireworks AI, has simply raised $1.505 billion in a Sequence D at a $17.5 billion valuation, led by Atreides Administration, Index Ventures, and TCV, with NVIDIA, Lightspeed Venture Partners, and Evantic additionally taking part. The total investor record additionally contains 20VC, Bessemer Enterprise Companions, Perception Companions, Lone Pine Capital, Menlo Ventures, Ontario Academics’ Pension Plan, and others. The spherical arrives as Fireworks crosses $1 billion in annualised income, up fivefold year-over-year, and each day token quantity on its platform climbs from 15 trillion to greater than 40 trillion.

“There are two paths ahead for AI. In a single, intelligence belongs to some large labs, and everybody else rents it. Within the different, each firm on the planet builds specialised intelligence of its personal, formed by the area solely it understands. We’re constructing in the direction of the second,” stated Lin Qiao, co-founder and CEO, Fireworks AI.

What Fireworks truly does

Fireworks allows enterprises to fine-tune and serve open-source AI fashions on their very own proprietary information, quite than counting on a general-purpose system from a frontier lab. A financial institution, for example, may fine-tune an open mannequin on years of inside compliance paperwork so it understands regulatory language a generic assistant wouldn’t, then run that mannequin on Fireworks’ infrastructure with assured latency. Of the tokens processed on the platform at present, 95% come from fashions prospects have customised on their very own information — not off-the-shelf frontier fashions. Its enterprise base contains Uber, Shopify, Revolut, and Doximity.

Qiao co-founded the corporate alongside 5 others, all former Meta engineers — amongst them Dmytro Dzhulgakov and Dmytro Ivchenko, two Ukrainian engineers who had been PyTorch core maintainers at Meta earlier than relocating to the US and becoming a member of the founding staff. The identify Fireworks traces on to that PyTorch origin: torch carries the hearth.

A buyer focus danger the corporate has needed to outrun

The spherical additionally arrives with a notable backstory. As of final 12 months, roughly half of Fireworks’ income got here from a single buyer: AI coding startup Cursor. That focus danger turned acutely related in June, when SpaceX introduced a $60 billion all-stock deal to amass Cursor — a transaction not but closed, with regulatory approval anticipated in Q3 2026 — and Cursor started scaling its Composer mannequin on SpaceXAI’s Colossus compute infrastructure, lowering its dependency on third-party inference suppliers like Fireworks. Qiao has stated the corporate is “way more diversified proper now,” and the enterprise roster of Uber, Shopify, and Revolut helps that. However the fivefold income development appears totally different relying on how a lot of it Cursor drove, and any future S-1 will inform the total story.

A crowded discipline getting costlier

Fireworks is working in one among AI infrastructure’s most closely capitalised corners. Together AI raised $800 million at an $8.3 billion valuation simply 2 weeks earlier. Baseten raised $300 million at a $5 billion valuation from IVP and CapitalG, with NVIDIA contributing $150 million. Groq raised $650 million in June 2026 after licensing its chip know-how to NVIDIA. Microsoft Azure and AWS are folding managed open-model internet hosting straight into their very own platforms — doing what Fireworks does, bundled into current cloud contracts.

That final level is the sharpest long-term query going through Fireworks. NVIDIA is concurrently an investor and an organization actively increasing into inference by way of its personal acquisitions. Microsoft is a companion and a platform competitor. Fireworks is staking its place on customisation depth — the declare that the majority enterprises want fashions reshaped round their very own information, not simply fashions served sooner — however whether or not that differentiation holds as soon as hyperscalers begin bundling the identical instruments at no cost is the query the following 12 months of enterprise AI spending will reply.

The worldwide generative AI market was valued at $22.2 billion in 2025 and is projected to achieve $324.7 billion by 2033, in accordance with Grand View Research. Fireworks is utilizing the brand new capital to fund international compute growth, engineering hires, and deeper partnerships with Microsoft and NVIDIA. Headcount is predicted to develop from round 200 to 600 by finish of 2026.

That is Fireworks’ fourth funding spherical — from $552 million at Sequence B in July 2024, to $4 billion at Series C in October 2025, and now $17.5 billion at Sequence D. For the girl who spent 7 years constructing AI’s most necessary open-source framework, the trajectory is both proof the wager was proper, or the setup for a extra difficult story as soon as the hyperscalers resolve to take the market critically.