Frontier model company for software engineering — GitHub CTO-built, now Nvidia's $7B bet on an open-weight U.S. alternative to Chinese AI
HQ: San Francisco, California, United States | Founded: 2023 | Employees: ~100 | Stage: Growth (Nvidia-backed, $12B valuation) | Website: https://poolside.ai
Poolside was founded in early 2023 by two people who had spent their careers building the tools developers already use: Jason Warner, GitHub's former CTO who oversaw the incubation of Copilot — the product that made AI coding mainstream — and Eiso Kant, a repeat founder of developer-tools companies including source{d} and sourcegraph-adjacent infrastructure. Their thesis was that code is the ideal training ground for machine intelligence: it is verifiable, structured, and represents the closest thing to executable reasoning.
The company spent its first two years training frontier models focused on software engineering — reasoning-heavy models trained on massive code corpora with reinforcement learning from execution feedback. It raised a $126M seed (2023) and then a $500M Series B in October 2024 led by Bain Capital Ventures with eBay Ventures, Nvidia, and others, valuing it at $3B with $626M total raised.
In August 2026 the company's trajectory changed completely. Nvidia agreed to pay Poolside $6 billion to license its model-development software, and separately invested $1 billion at a $12 billion pre-money valuation — a deal structure that keeps Poolside independent while giving Nvidia industrial-scale AI model capacity and most of its engineering talent's output. WSJ framed the deal as Nvidia building a powerful U.S. open-weight alternative to Chinese AI models; existing investors will be paid out $76.20 per share by the end of 2027 under the terms reported by The Information/Newcomer.
The strategic logic is unusual: Nvidia — which sells the compute everyone else trains on — is now paying a startup it helped fund to build frontier models, competing indirectly with the OpenAI/Anthropic ecosystem that buys its chips. For Poolside, the deal converts a promising but capital-intensive model company into one of the best-funded AI labs in the world per employee.
Poolside made the most consequential pivot in AI coding: from selling developer tools to becoming Nvidia's $7 billion weapon for open-weight AI — a $6B license plus $1B investment at a $12B valuation to build a U.S. alternative to Chinese open models. Fewer than 100 people, roughly $6B+ committed against the team.
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