ReasonBlocks YC Application

Spring 2026Active

ReasonBlocks 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

Sajeev MageshCEO & Co-Founder
Rohan VijFounder

What ReasonBlocks does

ReasonBlocks is the runtime layer that makes AI agents cheaper and more reliable. We correct agent reasoning and compress tokens mid-run, with gains compounding across runs. On SWE-Bench pro we have seen a 52% token reduction and 42% accuracy lift.

ReasonBlocks's YC application, reconstructed

Y Combinator application

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

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

ReasonBlocks

Describe what your company does in 50 characters or less.

Runtime layer making AI agents cheaper and reliable

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

We built ReasonBlocks as a runtime layer that sits between AI agents and language models. It intercepts the agent's reasoning, corrects errors, and compresses tokens mid-run so that each execution uses fewer tokens and produces more accurate results. For example, on the SWE-Bench pro benchmark, we cut tokens by 52% and improved accuracy by 42%. This means teams using AI agents get better results at lower cost without changing their 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.

We're based in San Francisco because it's where we connect with AI developers and early customers most actively. Staying here also keeps us close to YC and our network.

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 ReasonBlocks YC application?

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