Specialist AI, trained for you

Stop renting intelligence

Fine-tune models on your data. Watch them sharpen in production. Serve them faster and cheaper. Own every weight.

f(x) = argminθ L(θ; your data)

A letter from the founder

FEYN LABS · MEMO
SAN FRANCISCO · 2026

Intelligence shouldn’t be something you rent.

For three decades, the software you ran was yours — you owned it, shaped it, kept it. The last few years quietly reversed that. The most valuable thing your product does now arrives as an API call, billed by the token, frozen the day it shipped, and identical to your competitor’s.

We think that’s backwards. Your data, your tasks, the thousand edge cases only you have ever seen — that is the part no general model will hold. It deserves a model that learns it, keeps learning it, and answers to no one but you.

So we built Feyn. Fine-tune on your data, let it adapt as it runs, serve it small and fast, and keep the weights. No lock-in. No rent. The optimum is yours to own.

If you’re building something where the intelligence is the product, we should talk.

Shreyash Nigam
FOUNDER & CEO · FEYN LABS

The process

Intelligence, learned from your product.

Four steps from the harness you run today to a specialist that keeps improving in production.

01 / DISCOVERY

We map the harness

We review your current setup, trace the workflow end to end, and agree on the metrics that define quality. Before anything changes, we fix what better means.

02 / REFINE

We lift the baseline

We sharpen the system you already run — context, prompts, model, plumbing — for measurable gains in days, and cleaner production data for the model we train next.

03 / SPECIALIZE

We train the specialist

We train a model fit to your workflow on real production behavior — including the rare, critical cases you can't afford to miss. A small model that holds the hard paths.

04 / COMPOUND

It keeps learning

In production, new cases feed back into the training loop. The specialist compounds — getting sharper as your product moves.

Own your intelligence.

See a model trained on your data, learning in your loop. Thirty minutes, no slides.