PerfectBit YC Application

Spring 2026Active

PerfectBit went through Y Combinator in the Spring 2026 batch as a B2B 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: Spring 2026
Industry: B2B
Team size: 2
Status: Active
Launched: 2026

Founders

Peter VajdaFounder
Seiji YamamotoFounder

What PerfectBit does

We create a new kind of data for training AI models. Most LLMs are pre-trained on noisy web-scraped text, but they hallucinate and still fail on tasks that humans find trivial. PerfectBit creates high-quality training data that's correct by construction. We verify against physics simulators, scientific databases, formal proof systems. LLMs, robotics, AI for Science, and more.

PerfectBit's YC application, reconstructed

Y Combinator application

PerfectBit, Spring 2026 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

PerfectBit

Describe what your company does in 50 characters or less.

Training data for frontier AI labs

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

We create high-quality training datasets that are correct by construction for training AI models at the frontier. Unlike most training data scraped noisily from the web, our data is verified using physics simulators, scientific databases, and formal proof systems. This drastically reduces hallucinations and errors in LLMs and robotics AI, especially for scientific and technical tasks.

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

We are based in San Francisco, CA, and PerfectBit will remain based here after YC.

Explain your decision regarding location.

San Francisco is where both founders live and is a hub for AI research and frontier labs, which are our main customers.

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 PerfectBit YC application?

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