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For the free endpoint, please do not upload any confidential information or personal data (such as voices or faces of people). Your use is logged for security purposes and to improve NVIDIA products and services. The logged session data for improvement purposes is not linked to your identity or any persistent identifier. For more information about NVIDIA's data processing practices, see Privacy Policy(opens in new tab). By using this free endpoint, you consent to NVIDIA's collection, recording, and use of such information and the NVIDIA API Trial Terms of Service(opens in new tab)

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NVIDIA: Nemotron 3 Ultra

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

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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.

It is particularly strong at multi-step reasoning and planning, with high-throughput inference designed for high-volume agent pipelines. It is part of the NVIDIA Nemotron family of open models for agentic AI.

Modalities

In / Out Price

$0.50 / $2.20per 1M

Context

512K

Released

Jun 4, 2026

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About NVIDIA: Nemotron 3 Ultra

OpenRouter makes NVIDIA: Nemotron 3 Ultra available through a unified, OpenAI-compatible API using the model ID nvidia/nemotron-3-ultra-550b-a55b. Requests can be routed across 4 providers, including DeepInfra, Baseten, Together and Venice, with automatic failover when an endpoint is unavailable.

NVIDIA: Nemotron 3 Ultra accepts text and returns text. It has a 512,288-token context window and a maximum output of 16,384 tokens.

On OpenRouter, NVIDIA: Nemotron 3 Ultra costs $0.50/M input tokens and $2.20/M output tokens, with separate rates for Cache Read at $0.10/M tokens. Effective pricing can be lower when prompt caching applies. It was released on June 4, 2026.

More models from Nvidia

  • Nemotron 3.5 ASR Streaming Multilingual 0.6B
  • Nemotron 3.5 Lightning
  • Nemotron 3 Embed 1B (free)

Frequently asked questions

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.

Nemotron 3 Ultra costs $0.50/M input tokens and $2.20/M output tokens, with separate rates for Cache Read at $0.10/M tokens.

Nemotron 3 Ultra has a 512,288 token context window. It supports up to 16,384 completion tokens.

Yes. Nemotron 3 Ultra accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Nemotron 3 Ultra is served by 4 providers on OpenRouter: DeepInfra, Baseten, Together and Venice. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

Nemotron 3 Ultra was released on June 4, 2026.