About NVIDIA builder stack

NVIDIA gives your team an open-model layer for the hackathon: its Nemotron family of open models (open weights, data, and recipes), available free through OpenRouter's unified API. Built for agentic AI with reasoning—the kind of multi-step, tool-using workflows legaltech teams tend to prototype.

It's a simple REST API, and the Friday workshop walks you through onboarding so you arrive Saturday ready to build, not configure.

Pre-hackathon workshop: Building with NVIDIA

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👀 Why it's useful at LLMxLaw Hackathon

Some ideas on where to use the NVIDIA stack:

Open-model inference layer for agents. Run your agentic legal workflows on Nemotron's reasoning models—free on OpenRouter, $0/token. Reach for this when you want an open, customisable model rather than a closed API, and don't want token cost to cap how much you experiment.

Useful in combination with: Neo4j, EU Publications Office data API
Long-context document reasoning. Nemotron 3 Super carries a very large (1M-token) context window, so large case files, contract sets, or bundles can be reasoned over with less aggressive chunking. Useful in combination with: Neo4j (graph retrieval), Perplexity (live search/agents)
Multimodal intake. Nemotron 3 Nano Omni reads text, images, video, and audio in a single loop—useful for scanned filings, exhibits, or recorded proceedings rather than text alone. Useful in combination with: Lovable / Momen (frontend)

🔑 How access works: self-serve

There's nothing to install—you just need to create a free OpenRouter account to call the Nemotron :free endpoints. Set the model string (e.g. nvidia/nemotron-3-super-120b-a12b:free) and your OpenRouter key, and you're ready to go.

You’ll be guided through the setup on the Friday workshop: Building with NVIDIA.

👉 Get started!

It's a plain REST API, so any HTTP client or SDK works. A minimal call to a free Nemotron model on OpenRouter:

curl <https://openrouter.ai/api/v1/chat/completions> \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nvidia/nemotron-3-super-120b-a12b:free",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

For build.nvidia.com, open any model on the catalog and copy the ready-made code snippet shown on its page; it includes the exact endpoint and model string.

✅ Before the hack: your 3-step prep

Save time at the hackathon and get familiar with NVIDIA AI before you arrive!

Create your account: create a free OpenRouter account.
Send one test call to a Nemotron :free model so you know your key works and the setup feels familiar.