Reactor
Data & simulation · US
Ex-Apple Vision Pro and Luma AI founders building the real-time inference infrastructure layer for world models — a developer platform for running generative video, world models and robot policies at sub-50ms latency.
Reactor is the developer platform (SDK + API) for real-time generative media and world models. Its proprietary inference engine, globally distributed GPU cloud and low-latency streaming layer serve models at 60+ FPS and sub-40ms latency — against a 400ms+ industry average — via a single unified API. It hosts third-party models (MiniMax, Vidu, LTX, Alibaba, ByteDance) and powers real-time interactive video for media/entertainment customers. In physical AI, Reactor Robotics runs world models as closed-loop simulated environments to train/evaluate robot policies, and serves robot policies from a distributed GPU cloud with observations/actions streamed in real time, hosting policies from NVIDIA, Black Forest Labs, Robbyant and Xiaomi. Named customer: Overworld, a real-time world-model lab. Backed by Lightspeed, WndrCo, NVIDIA (NVentures), Amplify Partners, Sky9 Capital, Sapphire Ventures and FPV Ventures.
Research mapping
Physical AI / Sim-to-Real, Digital Twins & Validation (L9) / Data & simulation
Evidence boundary
Original analysis and independent corroboration remain under development. Commercial scale and durable technical advantage remain under review.
What makes it defensible
The sub-50ms real-time inference/streaming layer: frontier world-model and robotics labs can build the models, but serving them interactively demands purpose-built low-latency GPU infrastructure (Reactor’s custom kernels + global GPU cloud) — the toll-road between model and production.
Position in the stack: Infrastructure layer for real-time world models (pa-9): runs world models as closed-loop simulated environments for robot-policy training/evaluation and serves robot policies via a globally distributed GPU cloud. Hard to copy because sub-40ms serving at scale requires in-house GPU kernels plus a global GPU network — not model weights.
Who buys it
Named customers: Overworld (named customer — real-time world-model lab)
Founding team
Alberto Taiuti — Co-founder & CEO — Former CTO and co-founder of Luma AI; former technical lead on Apple Vision Pro.
Bryce Schmidtchen — Co-founder & CTO — Former technical lead on Apple Vision Pro (kernel optimization, computer vision for AR/VR).
SourceFinancing detail
- Last round
- $59M Series A (May 2026)
Investors: Lightspeed Venture Partners (lead), NVIDIA (NVentures), Sapphire Ventures, WndrCo, Amplify Partners, Sky9 Capital, FPV Ventures
Mapped funds and investors
Direct relationships supported by published evidence.
Reported holdings as-of
No sourced relationships mapped yet.
Disclosed investment history
No sourced relationships mapped yet.
Showing up to four relationships in each group. ETF weights describe the fund’s portfolio, not ownership of this company. Private investment history does not establish current ownership.
Evidence & media
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Reactor Expands Investors in Series A Round to Scale Real-Time World Model Infrastructure
What this source supports: NVIDIA (NVentures) + Sapphire Ventures join Series A; sub-40ms / 60+ FPS; robotics as closed-loop sim environments.
What it does not establish: No round size, no valuation.
Source -
Reactor publishes the FastH3-Omni engineering deep dive (real-time video + synchronized audio; 5s 1344x768 clip 42s -> 14.7s on 4xB200)
Source -
Reactor cuts Wan VAE decoder time per chunk from 133.8 ms to 60.2 ms (2.2x) at equal output quality for real-time world models
Source
Timeline
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Product
Reactor cuts Wan VAE decoder time per chunk from 133.8 ms to 60.2 ms (2.2x) at equal output quality for real-time world models
Source -
Product
Reactor publishes the FastH3-Omni engineering deep dive (real-time video + synchronized audio; 5s 1344x768 clip 42s -> 14.7s on 4xB200)
Source -
Financing
NVIDIA (NVentures) and Sapphire Ventures join Series A; $74M total raised
Source -
Financing
$59M Seed + Series A led by Lightspeed (Amplify Partners, WndrCo, Sky9 Capital, FPV Ventures); emerges from stealth
Source