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NVIDIA: Nemotron 3 Ultra
nvidia/nemotron-3-ultra-550b-a55btextReasoning
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
messagesrequiredreasoning_effortoff · medium · hightemperature0–2max_tokensoptionalstreamtrue · falseHow to use via API
from openai import OpenAIclient = 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="medium", # off · medium · hightemperature=0.7,max_tokens=1024,stream=False,)print(resp.choices[0].message.content)# Стриминг: stream=True — ответ приходит чанкамиfor chunk in client.chat.completions.create(model="nvidia/nemotron-3-ultra-550b-a55b",messages=[{"role": "user", "content": "Привет"}],stream=True,):print(chunk.choices[0].delta.content or "", end="", flush=True)
