Reactor
Reactor is an artificial intelligence company in San Francisco, United States, founded in 2025. It has raised $118.0M across 4 rounds, most recently a $59.0M Series A in May 2026.
The developer platform for world models
- Headquarters
- San Francisco, California
- Employees
- 11–50
- Founded
- 2025
- Business Model
- B2B
- Website
- reactor.inc
- Total Funding
- $118.0M
- Last Round
- $59.0M Series AMay 2026
- Rounds
- 4
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 4 funding rounds and 5 investors for this company. The full record is or through the API.
About
Reactor is the infrastructure layer for real-time generative video and world models. The platform provides serverless GPUs, dedicated clusters, and sub-50ms streaming globally, enabling developers to build interactive AI worlds and experiences. Reactor offers a unified SDK and API accessing all top production-ready world models including its own Helios model.
Summary
It lists 11–50 employees. It has raised $118.0M in total across 4 rounds, most recently a $59.0M Series A round in May 2026. Investors include Lightspeed Venture Partners, WndrCo and Amplify Partners.
Tech & App Stack
4 technologies & apps tracked
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Funding History
May 2026
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Funding: Seed. Amounts, valuations, and investors where available.
Investors
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