River AI, the two-month-old startup co-founded by former xAI co-founder Igor Babuschkin, has emerged from stealth with a jaw-dropping $1.1 billion in combined Seed and Series A funding at an estimated $5 billion post-money valuation. The round, announced August 11, 2026, was co-led by General Catalyst and AMP PBC, with participation from AMD Ventures, NVIDIA, Temasek and Y Combinator.
An open stack for personal agents
River AI is pitching itself as a bottom-to-top rebuild of the AI stack — training, models, product and hardware — designed around personal agents that users own rather than intelligence rented from a handful of frontier labs. Babuschkin, who left xAI earlier this year, argues the current oligopoly of foundation-model providers is a bad match for the coming era of always-on personal AI.
General Catalyst goes big on stealth
The scale of the raise is unusual for a company only weeks out of incorporation, but reflects the same investor appetite that just pushed Lovable to $13.3 billion and drove Nvidia's $500 billion compute financing platform. Sources say General Catalyst treated the deal as a strategic anchor in its personal-AI thesis.
Chips, credibility and compute
The presence of both NVIDIA and AMD Ventures is notable — a rare instance of the two chipmakers backing the same startup. Along with Y Combinator's participation, the round gives River AI a rare mix of foundational compute relationships and cloud credit heft to attempt what Babuschkin has described as a first-principles rewrite of consumer AI infrastructure.
What's next
River AI hasn't disclosed product timelines, though the company said the capital will fund model training, custom hardware research and product engineering. Investors are effectively betting Babuschkin can repeat inside a startup what he helped build at OpenAI, DeepMind and xAI — this time with users, rather than platforms, at the center.
Reporting based on coverage from TechCrunch, Bloomberg and River AI's own announcement.