---
name: Nemotron 3 Ultra 550B A55B
slug: nemotron-3-ultra-550b-a55b
type: LLM
providers:
  - togetherai
  - openrouter
description: >-
  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...
tags:
  - open-source
  - reasoning
  - tool-use
  - nemotron
  - llm
is_open_source: true
context_window: 1000000
max_output: 512300
pricing:
  - image: 0
    input: 0.6
    output: 3.6
    provider: togetherai
  - image: 0
    input: 0.6
    output: 3.5999999999999996
    provider: openrouter
  - image: 0
    input: 0
    output: 0
    provider: openrouter (Free Tier)
release_date: '2026-06-04'
openrouter_id: nvidia/nemotron-3-ultra-550b-a55b
capabilities:
  audio: false
  vision: false
  tool_use: true
  citations: false
  reasoning: true
---
Nemotron 3 Ultra 550B A55B is a LLM model.
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...