Nemotron 3 Ultra

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nemotron-3-ultra-550b-a55b

Nvidia|Created Jun 4, 2026|512.3k context

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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 supports text input and output with a context window of up to 1M tokens. It is suited for long-running agentic workflows, including agent orchestration, coding agents, deep research, and complex enterprise tasks.

Overview Specifications Activity Performance Uptime Examples API Reference

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Pricing-50%

Pay-as-you-go rates for this model. More details in the billing guide.

Input Tokens (1M)

$0.30

Cached Input Tokens (1M)

$0.10

Output Tokens (1M)

$1.80

Capabilities

Input Modalities

Text

Output Modalities

Text

Supported Parameters

Available parameters for API requests

Frequency PenaltyLogprobsMax Completion TokensPresence PenaltyResponse FormatReasoning EffortStopTemperatureTool ChoiceToolsTop PParallel Tool CallsPredictionLogit Bias