NVIDIA Nemotron 3 Ultra NVFP4 is the 4-bit floating-point build of NVIDIA's largest open-weight reasoning model, pairing 550B total parameters with 55B active per token through a hybrid Mamba-Transformer LatentMoE architecture. It carries Multi-Token Prediction layers for native speculative decoding and is built for long-context, high-complexity agentic workloads. NVFP4 is NVIDIA's 4-bit floating-point format, and this build is pre-trained directly in NVFP4 using a quantization-aware recipe, keeping the bulk of its layers in that compact representation while holding select layers in higher precision for stability. The result is a frontier-scale Mixture-of-Experts that needs far less accelerator memory to run, supported on NVIDIA Hopper and Blackwell GPUs and deployable through frameworks like vLLM, SGLang, and TensorRT-LLM. The model targets the most demanding agentic AI, including complex multi-step agents, long-context analysis, and high-accuracy reasoning over code, math, and science. It is released under the permissive OpenMDW License (v1.1), alongside a BF16 build for different hardware configurations.
Call NVIDIA Nemotron 3 Ultra NVFP4 on Opper with the OpenAI SDK. Sign up without a credit card. Get started
NVIDIA Nemotron 3 Ultra NVFP4 runs on 1 route through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.
| Provider | Region | Zero data retention | Training | Input | Output | Cache read |
|---|---|---|---|---|---|---|
| Multi | No | $0.60 | $2.40 | $0.12 |
NVIDIA Nemotron 3 Ultra NVFP4 runs on a single route through the Opper gateway today, so its availability is that provider's availability.
Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.
Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.
Each route hosting NVIDIA Nemotron 3 Ultra NVFP4 has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. GLOBAL; SCCs; DPA available.
Call NVIDIA Nemotron 3 Ultra NVFP4 through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.
NVIDIA Nemotron 3 Ultra NVFP4 is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.
Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "fireworks/nemotron-3-ultra-nvfp4",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
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