Lucid YC Application

Winter 2025Active

Lucid went through Y Combinator in the Winter 2025 batch as a Consumer company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Winter 2025
Industry: Consumer
Team size: 3
Status: Active
Launched: 2025

Founders

Rami SeidCo-Founder

What Lucid does

We are building universe simulations powered by interactive video models. We train video models that simulate hyper-realistic environments with immersive control, replacing hard-coded game or physics engines with dynamic neural networks. We built the fastest action-conditioned diffusion video model (running at 20+fps on a 4090 gaming gpu) to simulate minecraft. It is 5x faster than other minecraft World Models and was trained with 100x less resources. Our unique insight was relying on aggressive compression in our tokenizer (128x versus the traditional 8x), and because attention scales quadratically with # of tokens our model can run blindingly faster. Now we’re training a hyper realistic world model!

Lucid's YC application, reconstructed

Y Combinator application

Lucid, Winter 2025 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Lucid

Describe what your company does in 50 characters or less.

Interactive video models

What is your company going to make? Please describe your product and what it does or will do.

We build video models that simulate hyper-realistic environments with interactive control. Our product replaces hard-coded game or physics engines with dynamic neural networks, letting users simulate complex worlds like Minecraft much faster and with fewer resources. We start by running the fastest action-conditioned diffusion video model at over 20fps on a 4090 GPU, then scale toward hyper-realistic world models.

Where do you live now, and where would the company be based after YC?

We live in San Francisco, CA, and plan to base the company here after YC.

Explain your decision regarding location.

San Francisco is our home and the heart of AI and tech innovation. That proximity to talent, investors, and partners is critical for how we work and grow.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Lucid YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Lucid's public data (launch notes, founder backgrounds, product description). It shows how a company like Lucid would present itself to YC, not the text they submitted.