River AI Inc.

River AI is building the full stack for personally owned AI — meaning the infrastructure, models, hardware, and interfaces needed for individuals and enterprises to train, customize, and own their own AI rather than rent it from a big lab. Its first live product is the River API: a training service for open-weight models (35B–1T parameters) that runs LoRA fine-tuning and reinforcement learning in 15–20 minutes, billed per token with no idle GPU cost. Customers bring their own data, shape the model weights, and deploy to an OpenAI-compatible endpoint — fully owning the trained checkpoint. Longer-term, River is designing proprietary hardware for local on-device inference and conducting frontier deep learning research, with the stated goal of making AI "open, freely available, and affordable." Founded in April 2026 by Igor Babuschkin (xAI co-founder, ex-DeepMind, ex-OpenAI), the company is headquartered in Palo Alto and targets both developers and enterprises who want custom models without standing up their own infrastructure team.

~$5B post-money (reported; company did not officially confirm) valuation · 18 employees · 12 open roles

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River AI Inc.

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