All ModelschatNemotron 3 Ultra

Nemotron 3 Ultra

Name: Nemotron 3 Ultra
Availability: InStock
Author: NVIDIA

by NVIDIAPremium

Try on Kunya

chat

Nemotron 3 Ultra

550B MoE frontier reasoning model (55B active) — long-horizon agentic workflows, coding agents, and deep research with 1M context. Free on OpenRouter. Web search via Kunya smart search (native tool calling not supported).

Model ID:nemotron-3-ultra-free

API Documentation

Generate chat completions with this model.

POST/api/v1/chat/completions

GET /api/v1/models?type=chat

Request body

{
  "model": "nemotron-3-ultra-free",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "stream": false,
  "thinking": true
}

cURL example

curl -X POST https://kunya.ai/api/v1/chat/completions \
  -H "Authorization: Bearer kunya_YOUR_API_KEY" \
  -H "Content-Type: application/json"
  -d '{"model":"nemotron-3-ultra-free","messages":[{"role":"user","content":"Hello!"}],"stream":false,"thinking":true}'