/AI12d ago

Reactor emerges from stealth with $59M for infrastructure that streams real-time pixels from generative World Models

Lightspeed Venture Partners led the Seed and Series A rounds

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reactor
Rohan Paul
Vincent Sitzmann
Robert Scoble#323
Original post
Rohan Paul@rohanpaul_ai#1031inAI

Reactor just launched the infrastructure layer for real-time World Models.

Backed by $59M from Lightspeed, Amplify, Jeffrey Katzenberg, and world-class angels.

World Models change the job of video from playback to live generation, where pixels are created as the user acts and speaks. A few lines of the Reactor SDK and you're streaming pixels from a World Model into your product in real time.

That matters for games, creative tools, simulation, robotics, storytelling, and probably a few categories we do not have names for yet.

Developers can now build products where the world changes as the user acts.

7:56 AM · May 28, 2026 · 1.6K Views
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Many users are excited about Reactor raising $59M to build real-time world model infrastructure because of the team's strong execution and promising future applications.

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reactor@reactorworld

Today Reactor is coming out of stealth. We’ve raised $59M in Seed and Series A funding, led by @lightspeedvp, with participation from @AmplifyPartners, @wndrco, @Sky9Capital, and @FPVventures.

Reactor is the platform for building in the World Model era: the infrastructure that lets developers build with them at global scale for the first time. Stream from a frontier World Model to your app, in real time, all in under 10 lines of code.

World Models represent the next major shift in AI: pixels, audio and actions are generated on the fly, in real-time, in response to user inputs, and to the environment. Every time computing has made a shift from passive to interactive, entire industries appeared that didn't exist before. We're standing in front of such moment again.

Over the last 6 months, we’ve assembled an all-star team with alumni from Apple, Meta, Google, Luma AI, Netflix, and Replicate. We're already partnering with some of the biggest names and labs in the world, and hundreds of developers are already building on Reactor.

The World Model era starts now.

12dViews 12.5MLikes 2.9KBookmarks 566
Vincent Sitzmann@vincesitzmann

Great team and cool vision!

reactor@reactorworld

Today Reactor is coming out of stealth. We’ve raised $59M in Seed and Series A funding, led by @lightspeedvp, with participation from @AmplifyPartners, @wndrco, @Sky9Capital, and @FPVventures.

Reactor is the platform for building in the World Model era: the infrastructure that lets developers build with them at global scale for the first time. Stream from a frontier World Model to your app, in real time, all in under 10 lines of code.

World Models represent the next major shift in AI: pixels, audio and actions are generated on the fly, in real-time, in response to user inputs, and to the environment. Every time computing has made a shift from passive to interactive, entire industries appeared that didn't exist before. We're standing in front of such moment again.

Over the last 6 months, we’ve assembled an all-star team with alumni from Apple, Meta, Google, Luma AI, Netflix, and Replicate. We're already partnering with some of the biggest names and labs in the world, and hundreds of developers are already building on Reactor.

The World Model era starts now.

11dViews 8KLikes 49Bookmarks 15
ludwig@ludwigABAP

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures another word that doesn’t mean anything anymore (at least this one used to mean concrete things sometimes!)

12dViews 509Likes 5
Sani Ai Tech@SaniAiTech

@reactorworld $59M + real-time World Models in 10 lines of code = stealth to seismic fast.

12dViews 292Likes 1Bookmarks 1
Amplify Partners@AmplifyPartners

@reactorworld @lightspeedvp @wndrco @Sky9Capital @FPVventures LFG

12dViews 646Likes 5
Tiago Sada@tiagosada

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures congrats @_bschmidtchen!

12dViews 490Likes 1
AWS Startups@AWSstartups

@reactorworld Big news! Congrats!

12dViews 162Likes 1
Ronak Malde@rronak_

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures Congrats team!!

12dViews 983Likes 3
Lillian Ma@lillian_ma_

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures Will you be at CVPR next week?

12dViews 21Likes 2
Evan Kirstel #B2B #TechFluencer@EvanKirstel

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures Huge congrats on coming out of stealth — world models is the right bet. Would love to have you on @techimpactTV to unpack what you're building. DM open.

12dViews 661Likes 3
Ross Campbell@rossSpeak

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures So many congrats on the launch! Absolutely floored by what the future holds. The ability to shape worlds, and experiences, in realtime is so damn cool!

12dViews 588Likes 3
sudarshan@ItzSuds

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures I love this company so much. Great work guys, token factories will dominate the industry!

12dViews 555Likes 3
Eryk Dobrushkin@ErykDobrushkin

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures congrats @taiuti and @_bschmidtchen ! time to generate gta 6 before its released

12dViews 164Likes 4
arian ghashghai@arian_ghashghai

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures LFG

12dViews 307Likes 3
Ryan DeLuca - @VR@VR

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures This is the actual metaverse. I can't wait to author my own VR world with characters that seem as real as any human and stories that unfold procedurally around me, with me as the protagonist (or villain or sidekick or whatever I lucid dream).

12dViews 293Likes 3
Alberto@taiuti

@lillian_ma_ @reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures Yes, find us here: https://luma.com/hkik7xtr

12dViews 12Likes 1
Monica L@mon__lim

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures so pumped for this!! LFG @taiuti !!! no one better to build this

12dViews 364Likes 2
Eric Lay@itsericlay

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures congrats, so cool to see everything come to life!!

12dViews 106Likes 3
Alberto Tono@albertotono3

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures Congratulations 🥳 🎊

12dViews 94Likes 3
Eilam Levitov@votivele

@reactorworld @lightspeedvp @AmplifyPartners @wndrco @Sky9Capital @FPVventures Looks so sick, so excited for the future of world models and what this insane team is building!

12dViews 284Likes 2
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