River AI is a full-stack AI company based in Palo Alto, California, led by CEO Igor Babuschkin. Its platform delivers LoRA fine-tuning and reinforcement learning capabilities for frontier open-weight models via an API, enabling developers and enterprises to train, tune, deploy, and serve custom models. The company targets use cases where customers lack dedicated infrastructure teams or access to expensive hardware. River AI touts continuous improvement of personal AI through its platform features. Financially, the company completed a $1.1 billion funding round in August 2026, which it intends to use to expand operations and accelerate development. The article does not disclose revenue, user metrics, or prior funding details.

Total raised

$1.1B

Funding rounds

1

Latest round

Series A

Latest activity

Aug 2026