Other

NVIDIA: Nemotron 3 Ultra (free)

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

canonical: nvidia/nemotron-3-ultra-550b-a55b-20260604

Descriptionfrom OpenRouter

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...

Context length

1,000,000 tok

Max completion

65,536 tok

Knowledge cutoff

—

Expires

—

Added to OpenRouter

6/4/2026

Cache last refreshed

11/12/2026

Primary modality

text->text

Source

OpenRouter

Input modalities

text

Output modalities

text

Pricing

Field	Per token (USD)	Per million
prompt	0	—
completion	0	—

Supported parameters(9)

include_reasoningmax_tokensreasoningreasoning_effortseedtemperaturetool_choicetoolstop_p

Default parameters

{
  "temperature": 1,
  "top_p": 0.95,
  "top_k": null,
  "frequency_penalty": null,
  "presence_penalty": null,
  "repetition_penalty": null
}

OpenRouter page Hugging Face

Videos

47:51

Ranking major U.S. Open-Weights Models. (Where does Ripple 65B fit in?)

Nov 6, 2026 · YouTube

Rounds

13 answersin this database. A round opens every model's answer to the same prompt.

Nov 6, 2026CodingTwo kilobytes70goodin a video round answer
Nov 6, 2026CodingSpinning cat meme10very badin a video round answer
Nov 6, 2026CodingNeon Unicorn Frappuccino30badin a video round answer
Nov 6, 2026Small ModelsAWS Quick Ten90excellentin a video round answer
Nov 6, 2026CodingThe Cybertruck rally10very badin a video round answer
Nov 6, 2026Small ModelsRust Quick Ten87very goodin a video round answer
Nov 6, 2026Small ModelsTailwind Quick Ten97excellentin a video round answer
Nov 6, 2026CodingBird Breakdance Animation30badin a video round answer
Nov 6, 2026CodingEscalator Reversal Disaster10very badin a video round answer
Nov 6, 2026Small ModelsPython Quick Ten100excellentin a video round answer
Nov 6, 2026CodingUmbrella In High Wind10very badin a video round answer
Nov 6, 2026CodingDrop the slinky30badin a video round answer
Aug 18, 2026Psychology & Business AcumenThe weekend found footage movie95excellentin a video round answer