River AI
Funding History
| Seed/Series A · 08/2026 | $5.0B |
|---|
About
Provides an API for reinforcement learning and LoRA fine-tuning on open-weight AI models, billed per token for training and inference.
- founded
- April 2026
- headquarters
- Palo Alto, CA
- totalFunding
- $1.1B
- valuation
- $5B
Overview
River AI was incorporated in Nevada on April 20, 2026, and is headquartered in Palo Alto, California. The company was founded by Igor Babuschkin, who previously worked on generative modeling and reinforcement learning at Google DeepMind, large-scale training at OpenAI, and co-founded xAI before leaving to start River AI.
The company's stated aim is to build personally trainable AI assistants rather than one-size-fits-all frontier models, spanning training infrastructure, an open-weight model layer, and eventually dedicated hardware for running personal AI locally. Its API offers reinforcement learning and low-rank adaptation (LoRA) fine-tuning on open-weight models, with token-based billing for training and inference.
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