Rain AI
The business, the turning points, and the decisions behind them.
01 / WHAT IT BUILT
What the company did
Rain AI was a San Francisco-area semiconductor startup founded in 2017 by Gordon Wilson, Juan Claudio Nino and Jack Kendall. It built neuromorphic (brain-inspired) compute-in-memory chips that promised dramatically lower power consumption for AI inference at the edge — security cameras, drones, wearables. Personally backed by Sam Altman (OpenAI signed a $51 million letter of intent for its chips in 2019), with additional funding from Saudi PIF-linked Prosperity7 Ventures and Baidu Ventures, it raised $118 million, taped out two chips and shipped evaluation units to select partners in late 2024, but never reached volume production.
02 / Rain AI FAILURE REASONS
Failure reasons
A planned $150 million Series B collapsed in early 2025. The Saudi-linked investor was forced out over US national-security concerns, leadership turned over three times in about eighteen months (Wilson to Will Passo to Jack Kendall), and the company had no disclosed paying customers plus weak enterprise sales capability, making the round impossible to assemble even with Altman's support. With cash rapidly depleting, Rain raised only a $3 million bridge and explored a sale, with OpenAI, NVIDIA and Microsoft evaluating it. Nearly all employees were laid off in June 2025, and OpenAI later bought some of Rain's patents after declining a full acquisition. Coverage framed it less as a technology failure than as a go-to-market and capital failure: custom silicon is brutally expensive, and when the round evaporated there was no pivot that could save it. This concerns Rain AI's specific situation, not neuromorphic computing as a field.
03 / EVENT HISTORY
Events in the structured record
- Company founded
Gordon Wilson, Juan Claudio Nino and Jack Kendall found Rain AI to build neuromorphic compute-in-memory chips for low-power AI inference.
- Peak funding round
Sam Altman backs Rain AI personally; OpenAI signs a $51 million letter of intent for its chips. The company goes on to raise $118 million in total.
- Operations scaled back
The planned $150 million Series B collapses; leadership churns and cash depletes. Rain raises a $3 million bridge, explores a sale, and lays off nearly all employees in June 2025; OpenAI later buys some of its patents.
04 / CONTEMPORARY REBUILD ASSESSMENT
Difficulty of rebuilding this project today
Material for this section is being gathered and checked. It will appear here once ready.
Overall assessment: Not completed
05 / CAUSAL CHAIN
How the factors connect
- 01
2017: neuromorphic chip startup, Altman backing, $118M raised
- 02
2019: OpenAI signs $51M chip letter of intent
- 03
Early 2025: $150M Series B collapses; investor forced out; CEO churn
- 04
June 2025: near-total layoffs; OpenAI buys some patents