Nemotron 3 Ultra 550B A55B
nvidia/
NVIDIA model · Served by Together AI · live on the gateway
Pricing
About Nemotron 3 Ultra 550B A55B
NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it...
What it supports
- Tool calling (function calling)
- JSON mode and structured output
- Image input (vision)
- Audio input
- Extended reasoning
- Streaming responses
- OpenAI SDK, Anthropic SDK and any OpenAI-compatible client
Make a request
curl https://rapidrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $RAPIDROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "nvidia/nemotron-3-ultra-550b-a55b",
"messages": [{ "role": "user", "content": "Hello" }]
}'Frequently asked
How do I call Nemotron 3 Ultra 550B A55B through an OpenAI-compatible API?
Point any OpenAI-compatible client at https://rapidrouter.ai/api/v1 with a Rapid Router API key and set the model to nvidia/nemotron-3-ultra-550b-a55b. The chat completions endpoint is https://rapidrouter.ai/api/v1/chat/completions.
What is the context window of Nemotron 3 Ultra 550B A55B?
Nemotron 3 Ultra 550B A55B has a context window of 202,800 tokens on Rapid Router, and returns up to 182,520 output tokens per reply.
What can Nemotron 3 Ultra 550B A55B do?
On Rapid Router, Nemotron 3 Ultra 550B A55B supports tool calling, JSON mode, extended reasoning.