River AI raises $1.1B seed/Series A just 2 months after founding
Original: General Catalyst leads $1.1B round into 2-month-old River AI
Why This Matters
The $1.1B raise for a 2-month-old startup signals intensifying investment in post-training infrastructure and personalized AI agents.
River AI, founded by xAI co-founder Igor Babuschkin, raised $1.1B in a seed/Series A round led by General Catalyst and AMP PBC, with Nvidia, AMD Ventures, Y Combinator, and Temasek participating. The company emerged from stealth in June 2026 with a mission to rebuild the AI stack end to end.
River AI, an AI startup founded by Igor Babuschkin — a co-founder of xAI with prior roles at DeepMind and OpenAI — has closed a $1.1 billion seed/Series A round led by General Catalyst and AMP PBC (an AI-focused fund launched in 2026 by former a16z general partner Anjney Midha). Nvidia, AMD Ventures, Y Combinator, and Temasek also participated. The company came out of stealth in June 2026 with a goal to reinvent AI training from the ground up, building toward personally trainable agents rather than general-purpose human-replacement tools. 'Capable agents will be a normal part of everyday life... like guardian angels: quietly present, on your side,' Babuschkin wrote in his launch blog. River currently offers a developer API billed per 1 million tokens, supporting both reinforcement learning (RL) and LoRA fine-tuning on open models — positioning it as an alternative to prompt engineering. For enterprises, River claims its neocloud platform can complete complex RL runs in 15–20 minutes with no infrastructure team, at 2–4x cost savings versus closed-source alternatives.