YC Summer 2026 (S26) company

Belvedir

The easiest way to make custom AI models

b2bartificial intelligencemachine learningdeveloper tools15 public signals

About Belvedir

Belvedir makes it cheap and easy for anyone to make custom AI. Connect us to your agent traces through our SDK and we autonomously train custom models + harnesses + routers, privately deploy them, and recursively improve them as they are used. Our customers have seen 10x reductions in inference costs and 2x increases on benchmark scores. Custom AI models are going to win. Belvedir is the infrastructure needed to make trillions of them.

Public traction evidence

Each signal links to the public source used for attribution.

  1. X

    Today, we're launching @belvedir_ai We're making private AI models cheap and easy so the world can have trillions of them.

    Today, we're launching @belvedir_ai We're making private AI models cheap and easy so the world can have trillions of them. Private AI models are cheaper, better, faster, and protect your data from frontier labs, but they're still to expensive and difficult to make for startups

  2. X

    continual learning is a bullshit word.

    continual learning is a bullshit word. i’ve heard at least these 4 different things be called continual learning. we should have distinct names for these: - in context learning -> technically continual learning assuming that in the future you will eventually have infinite

  3. X

    why is everyone who works on models a researcher.

    why is everyone who works on models a researcher. why aren’t they just engineers who work on models?

  4. X

    which is more likely to be the end state of AI? 1.

    which is more likely to be the end state of AI? 1. models generalize so well that one god model is all that the world needs 2. finetuning / customization will always be necessary and there be trillions of diverse models **having this debate with a friend rn

  5. X

    i would pay so much money for a service that helps people find a lease, set up utilities and wifi, furnish it, get essentials, and clean it once a month for both home and office

    i would pay so much money for a service that helps people find a lease, set up utilities and wifi, furnish it, get essentials, and clean it once a month for both home and office

  6. X

    We're live!

    We're live!

  7. X

    Goats

    Goats

  8. X

    holy shit

    holy shit