Cortex · The open AI model lab

Premium open models. Zero lock-in.

Cortex is one beautiful workspace to run, compare and build on top of the world's best open AI models — so you always use the right model for the job.

Start free See how it feels

Free forever plan · No credit card required · Cancel anytime

cortex / workspace
78%
64%
91%
Live
Running
Queued
1
workspace for every open model
0
lock-in, ever
2×
more free usage than typical plans
Side-by-side
model comparisons
Chat playgroundSide-by-side comparePrompt libraryAPI accessCustom assistantsDocument Q&AUsage insightsTeam workspacesPrivacy-firstModel freedomChat playgroundSide-by-side comparePrompt libraryAPI accessCustom assistantsDocument Q&AUsage insightsTeam workspacesPrivacy-firstModel freedom
The problem

Choosing an AI model shouldn't mean choosing a cage.

Juggling accounts, keys and closed ecosystems slows you down and locks you in. Cortex gives you freedom and clarity in one place.

  • 01Too many accounts and dashboards
  • 02No easy way to compare quality
  • 03Getting locked into one ecosystem
  • 04Unpredictable costs as you grow
What you get

Everything you need. Nothing you don't.

One workspace

Run the best open models from a single, beautiful interface.

Compare side by side

Send one prompt to many models and pick the winner with your own eyes.

Build assistants

Turn your best prompts into reusable assistants for you and your team.

Developer-ready

One simple API to plug the right model into your product.

Private by design

Your prompts and data stay yours.

Clear usage insights

See what you use and what it costs, at a glance.

How it feels

From question to best answer in four steps.

  1. 1

    Open your lab

    Sign up and your workspace is ready instantly.

  2. 2

    Ask anything

    Chat, upload documents or run prompts across models.

  3. 3

    Compare and choose

    See results side by side and pick the best fit.

  4. 4

    Build on it

    Save assistants or plug the winner into your app via API.

The result

Better answers, more freedom, fewer tabs.

Better results

Always use the model that's best for the task in front of you.

Total freedom

Switch anytime without rebuilding anything.

Simplicity

One login, one workspace, one place to build.

Made for

For people who want the best model, every time.

The founder

Research, write and plan faster with the right model on call.

The developer

Prototype with many models and ship with one API.

The team lead

Give your team a shared, private AI workspace.

Pricing

Start free. Grow when you're ready.

Lab

Generous free usage to explore.

$0forever
  • Access to popular open models
  • Side-by-side compare
  • Prompt library
  • Personal workspace
Start free
Most popular

Pro

For power users and builders.

$29/month
  • Full model catalog
  • Higher usage limits
  • Custom assistants
  • API access
Go Pro

Team

For teams building together.

$249/month
  • Everything in Pro
  • Shared team workspaces
  • Admin controls
  • Priority support
Start Team
FAQ

Questions, answered.

Still curious? Talk to our team.

What are open models?

Open models are AI models that are openly available, giving you more choice and no lock-in.

Do I need to be technical?

Not at all. The chat workspace works like any assistant. The API is there when you want it.

Is my data private?

Yes. Your prompts and documents belong to you.

Can I switch models anytime?

Yes. That's the whole point — use whichever model suits the task.

Is the free plan really free?

Yes, free forever with generous usage.

Can I cancel anytime?

Yes. Paid plans are month-to-month.

Your AI, your choice.

Open your Cortex lab free and find the best model for every job.

Start free