River AI

Biography

River AI is a United States artificial intelligence startup founded in 2026 by Igor Babuschkin, a co-founder of xAI who previously worked at OpenAI and Google DeepMind. The company says it is rebuilding the AI stack end to end so that individuals and companies can train and own personal agents rather than renting capability from a handful of model providers. Its initial product is an API for customizing open models, offering reinforcement learning and LoRA fine-tuning so customers can adapt a base model to their own tasks and keep the resulting weights. That positioning puts it against both closed frontier labs and the managed fine-tuning services offered by cloud vendors. For AI readers, River AI is part of a broader argument about whether value in AI settles with a few large models or with the layer that specializes them. Our coverage has followed the company's 1.1 billion dollar raise, which came roughly two months after it left stealth.

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