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NVIDIA: Nemotron 3 Ultra (batch)

nvidia/nemotron-3-ultra-550b-a55b:batch · NVIDIATokenizer lineage measured

Tokenizer lineage (measured): Mistral
Entered catalogue: 4 June 2026
Measurement: Variant: inherits its base model’s measurement
Evidence confidence: High

Why high: inherited from nvidia/nemotron-3-ultra-550b-a55b: a serving variant shares its base model's tokenizer.

Evidence

✓ inherited from nvidia/nemotron-3-ultra-550b-a55b: a serving variant shares its base model's tokenizer

Compare with NVIDIA: Nemotron 3 Ultra

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This entry is a serving variant of NVIDIA: Nemotron 3 Ultra. A variant shares its base model's tokenizer by construction, so the measurement lives on the base record and this page inherits it.

Identity statement

NVIDIA: Nemotron 3 Ultra (batch) is NVIDIA's model. Its measured tokenizer sits with the Mistral group, which is evidence that it builds on the Mistral tokenizer. Tokenizer reuse is normal engineering, open vocabularies travel between labs, and this says nothing against NVIDIA's authorship of the model itself.

What we checked

Four different kinds of evidence, and what each one showed

We checked	What we found	Where it came from
How it counts tokens	Not measured yet	we measured it
How its API is set up	A combination of settings no other listing in the catalogue uses	api_d0c2ec50
How much it can read and write	Reads up to 512,288 tokens at once	its own listing
Whether it thinks before answering	Reasons when asked to, at high, medium, high by default	its own listing

Declared record

What the catalogue claims about this 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...

Modalities: text->text
Declared tokenizer: Other
Prompt price: $0.60 / M tokens
Completion price: $3.60 / M tokens

Supported parameters

frequency_penaltyinclude_reasoninglogit_biasmax_tokensmin_ppresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatstopstructured_outputstemperaturetool_choicetoolstop_ktop_p

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

Catalogue entry Weights on Hugging Face

History

Every observation, kept as taken

4 June 2026Enters the OpenRouter catalogue with no declared family.

* NVIDIA: Nemotron 3 Ultra (batch) no longer appears in the OpenRouter catalogue, first absent from the snapshot of 3 September 2026. The record stays because the measurements above were real when they were taken and this address has been published.