Nemotron 3 Ultra (550B A55B) (Reasoning)
by NVIDIA
Nemotron 3 Ultra (550B A55B) (Reasoning) is a reasoning model from NVIDIA, released on June 4, 2026. It has a 262K-token context window and can generate up to 262K output tokens. API pricing is $0.5 per 1M input tokens and $2.2 per 1M output tokens. It ranks #59 of 220 models by Intelligence Score with a score of 36.
Nemotron 3 Ultra is NVIDIA's frontier-scale open model with 550B total / 55B active parameters, built for agentic reasoning, long-context analysis, tool use, and high-stakes RAG. It uses a hybrid Latent Mixture-of-Experts (LatentMoE) architecture interleaving Mamba-2, MoE, and select Attention layers, with Multi-Token Prediction (MTP) for native speculative decoding, and is pre-trained on ~20T tokens with an NVFP4 recipe. Reasoning is configurable on/off (plus a medium-effort mode) via the chat template. It supports up to a 1M-token context and 10 languages (English, French, Spanish, Italian, German, Japanese, Hindi, Korean, Brazilian Portuguese, Chinese). Released with open weights, training data, and recipes under the OpenMDW-1.1 license.
Key specs
| Provider | NVIDIA |
|---|---|
| Release date | 2026-06-04 |
| License | open weights |
| Context window | 262K tokens |
| Max output | 262K tokens |
| Input price | $0.5 / 1M tokens |
| Output price | $2.2 / 1M tokens |
| Intelligence Score | 36 |
| Coding index | 20.4 |
Quick answers
What is the context window of Nemotron 3 Ultra (550B A55B) (Reasoning)?
Nemotron 3 Ultra (550B A55B) (Reasoning) has a context window of 262K tokens, with a maximum output of 262K tokens per response.
How much does Nemotron 3 Ultra (550B A55B) (Reasoning) cost?
Nemotron 3 Ultra (550B A55B) (Reasoning) costs $0.5 per 1M input tokens and $2.2 per 1M output tokens through the API.
Is Nemotron 3 Ultra (550B A55B) (Reasoning) open source?
Yes. Nemotron 3 Ultra (550B A55B) (Reasoning) is an open model released under the open weights license.
When was Nemotron 3 Ultra (550B A55B) (Reasoning) released?
NVIDIA released Nemotron 3 Ultra (550B A55B) (Reasoning) on June 4, 2026.
How does Nemotron 3 Ultra (550B A55B) (Reasoning) compare to Claude Opus 5.5 (Reasoning)?
Nemotron 3 Ultra (550B A55B) (Reasoning) scores 36 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1. Input pricing is $0.5 vs $4 per 1M tokens.
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