River AI, the startup xAI co-founder Igor Babuschkin took out of stealth on June 10, 2026, has raised $1.1 billion across its Series Seed and Series A rounds, the company announced on August 11, 2026. General Catalyst and AMP PBC led the financing, with strategic investment from Nvidia and AMD Ventures and participation from Y Combinator and Temasek. River is two months out of its launch post and already carries one of the largest early financings of the year. The money backs an unusual thesis…
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