Nemotron 3 Ultra

Name: Nemotron 3 Ultra
Brand: nvidia
Price: 59.1 RUB
Availability: InStock

nvidia/nemotron-3-ultra-550b-a55b

textReasoning

NVIDIA open frontier model — 550B parameters with 55B active (hybrid Mamba-Transformer MoE). Strong at reasoning and agent orchestration, adjustable reasoning depth, 512k context.

Pricing

Request / 1M

Response / 1M

Parameters

messagesrequired

reasoning_effortoff · low · medium · high

temperature0–2

max_tokensoptional

streamtrue · false

How to use via API

from openai import OpenAI

client = OpenAI(base_url="https://api.mixen.ai/v1", api_key="mxn-...")
resp = client.chat.completions.create(
    model="nvidia/nemotron-3-ultra-550b-a55b",
    messages=[{"role": "user", "content": "Привет"}],
    reasoning_effort="low",  # off · low · medium · high
    temperature=0.7,
    max_tokens=1024,
    stream=False,
)
print(resp.choices[0].message.content)

Try in the botAPI docs

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