River AI raises $1.1B out of stealth

River AI, founded by xAI co-founder Igor Babuschkin, has raised $1.1 billion in a seed/Series A round led by General Catalyst and AMP PBC, according to TechCrunch’s funding report. The two-month-old company’s pitch is a stack for personally trainable agents: an API that supports reinforcement learning and LoRA fine-tuning, with a claim that complex RL runs can finish in 15–20 minutes without an infrastructure team. The number to file away is not the promise but the financing: a $1.1B war chest lets a newborn vendor buy distribution and compute before its product-market evidence exists; teams should watch for reproducible customer outcomes before treating personal agents as a category, alongside the archive’s analysis of agent memory and personal context.