River AI

AI models Series A (opens in a new tab) river.ai (opens in a new tab) · in/river-ai-official (opens in a new tab) · @river_ai_inc (opens in a new tab)

River sells an API that fine-tunes open models on a customer's own data and serves them on an OpenAI-compatible endpoint, with the weights owned by the customer. It is bought by companies running support queues, document pipelines or coding workflows, priced per token.

signals 02

September 2026
- River AI rewrites its homepage as a frontier AI lab (opens in a new tab)
  
  09-28 Campaign river.ai ↗ (opens in a new tab)
  
  River AI replaced its homepage between September 23 and 24: the old "Intelligence that flows with you" pitch.
August 2026
- Ships a fine-tuning API on the back of a $1.1B round (opens in a new tab)
  
  08-13 Funding techcrunch.com ↗ (opens in a new tab)
  
  River AI, the personal-agent startup ex-xAI co-founder Igor Babuschkin took out of stealth just two months.