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Nemotron 3 Ultra 550B

Nemotron
by NVIDIA

Open, efficient hybrid Mamba-Transformer MoE with 1M context, excelling in agentic reasoning, coding, planning, tool calling, and more.

Try in Chat
Free EndpointDownloadableJun 4, 2026open license8M API calls / 30d

Specifications

Context Length
1M
1,000,000 tokens
Input Price
Free
per 1M tokens
Output Price
Free
per 1M tokens
Modalities
1
text→text

Capabilities

text generationchatcodereasoningfunction callingagentic

Tags

agentcodingreasoningtool-callingMoE

API Usage

1Router is fully OpenAI-compatible. Just set the base URL and use this model ID:

nvidia/nemotron-3-ultra-550b-a55b
cURL
curl https://api.1router.com/v1/chat/completions \
  -H "Authorization: Bearer $ROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nvidia/nemotron-3-ultra-550b-a55b",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'