Every round on record, with the sources behind each and the investors on them.
A platform for developers to train and serve custom models
river.aiSilicon Valley, USAAI
| Round | Amount | Announced | Lead | Verified | Status | Sources |
|---|---|---|---|---|---|---|
| Series A Series A | $1.2B | 2026-09-23 | not stated | 1 | [ CHECK ] | 1 |
[ VERIFIED ]0.69 read against 1 source
[ BUILT WITH ]·[ SEARCH ]found by Firecrawl search: "Series A" raises million startup·[ SCRAPE ]1 page read: news.crunchbase.com·[ JSON ]round extracted with a schema, grounded to one sentence·[ VERIFY ]confirmedread back across 1 source·[ BRANDING ]logo and colour from the homepage·[ AGENT ]dossier built by the Firecrawl agent | ||||||
River AI gives developers and enterprises an API to train, tune, serve, and own custom AI models built on their data and tasks.
| Round | Amount | Announced | Lead |
|---|---|---|---|
| Series Seed | n/a | 2026-08-11 | General Catalyst, AMP PBC |
| Series A | n/a | 2026-08-11 | General Catalyst, AMP PBC |
River is targeting the gap between powerful general-purpose models and companies that need models tuned to their own data, tasks, and success criteria, promising reinforcement-learning runs in 15–20 minutes without an infrastructure team and at two to four times the cost savings versus closed-source alternatives. Its $1.1 billion Series Seed and Series A backing from General Catalyst, AMP PBC, NVIDIA, AMD Ventures, Y Combinator, and Temasek funds a broader bet that developers and eventually individuals will own and control personalized AI rather than rent intelligence from model labs.
None named.