River AI has raised about $1.1 billion in seed and Series A funding led by General Catalyst and AMP PBC, with strategic investment from NVIDIA and AMD Ventures, and is aiming to create AI that belongs to users rather than labs. Its River API enables LoRA fine-tuning and reinforcement learning on frontier open-weight models, allowing developers to train and deploy personal, continually improving AI while highlighting a multi-billion-dollar valuation in coverage of the round.

Business· Aug 11, 2026

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General Catalyst· Business · 18 sources · Aug 11, 2026Story

River AI Raises $1.1B for Open-Weight AI Full Stack

Business· Aug 11, 2026

Facts from Wikidata (CC0). Image by General Catalyst via Wikimedia Commons (Public domain).

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About General Catalyst

General Catalyst (GC) is an American venture capital firm headquartered in Cambridge, Massachusetts. Founded in 2000, it invests across seed, venture, and growth stages and manages more than US$43 billion in assets as of December 2024. The firm has invested in more than 800 companies. Its portfolio includes Airbnb, Anduril, Anthropic, Applied Intuition, Canva, Helsing, HubSpot, Legora, Mercor, Mistral, Ramp, Samsara, Stripe, and Zageno.

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Inception: 2000
Website: https://www.generalcatalyst.com/

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