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Specs

Model IDnvidia/nemotron-3-ultra-550b-a55b
Context window262K tokens
Max output183K tokens
Input price$0.60 / 1M tokens
Output price$2.40 / 1M tokens
Inputs → outputsText → Text
Open weightsYes

How to use Nemotron 3 Ultra in your app

The quickest way is through an API gateway such as OpenRouter, which uses the same format as the OpenAI API. Create a key, then send a request with the model ID nvidia/nemotron-3-ultra-550b-a55b:

curl https://openrouter.ai/api/v1/chat/completions \ -H "Authorization: Bearer $OPENROUTER_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "nvidia/nemotron-3-ultra-550b-a55b", "messages": [{"role": "user", "content": "Explain this in simple words..."}] }'

Prefer no code? Many tools in our AI tools directory run on models like this one.

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Questions about Nemotron 3 Ultra

What is Nemotron 3 Ultra?

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...

How big is the context window of Nemotron 3 Ultra?

Nemotron 3 Ultra can read up to 262,144 tokens in one request, roughly 196,608 words.

How much does Nemotron 3 Ultra cost?

Through OpenRouter, Nemotron 3 Ultra costs about $0.60 / 1M tokens for input and $2.40 / 1M tokens for output. Prices change, so check before large jobs.

Is Nemotron 3 Ultra open source?

Nemotron 3 Ultra has open weights, so you can download and run it yourself, subject to its licence.

What can Nemotron 3 Ultra take as input?

Nemotron 3 Ultra accepts text and produces text.

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Specs and prices come from OpenRouter and the provider, and are refreshed daily. Last checked 4 Jun 2026.

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