NVIDIA Nemotron 3 Ultra 550B API
Other
NVIDIA Nemotron 3 Ultra 550B-A55B — NVIDIA flagship reasoning model (550B total / 55B active MoE) tuned for agentic workloads, with a 1M-token context window.
About NVIDIA Nemotron 3 Ultra 550B
NVIDIA Nemotron 3 Ultra 550B is a large language model developed by Other. It's particularly well-suited for tackling complex, multi-step reasoning problems, orchestrating tool-using agents that call APIs and external services, producing structured outputs for reliable data extraction, and handling large contexts of up to 1M tokens. Its 1M-token context window means you can pass in entire documents, codebases, or conversation histories without losing context. Developers choose NVIDIA Nemotron 3 Ultra 550B when they need reliable, production-quality AI inference through a simple API — and on Qubax, it's available at a fraction of the cost of traditional providers.
In the broader AI landscape, NVIDIA Nemotron 3 Ultra 550B sits among the frontier-tier offerings from Other With advanced reasoning and agentic tool use, it competes with the most frontier-tier models on the market. What sets it apart on Qubax isn't just the model itself — it's the accessibility. Rather than dealing with enterprise contracts or traditional payment rails, you get instant access via an OpenAI-compatible endpoint. That means you can drop NVIDIA Nemotron 3 Ultra 550B into Cursor, Cline, LangChain, or any framework that speaks the OpenAI protocol and start building immediately.
Qubax offers NVIDIA Nemotron 3 Ultra 550B at 74% below OpenRouter's price — just $0.130 per million input tokens and $0.650 per million output tokens. That pricing advantage compounds quickly at scale: a high-volume application sending millions of tokens per day can save significantly compared to using OpenRouter or the provider directly. And because Qubax runs on crypto-native infrastructure, you can pay with USDC, USDT, ETH, BTC, or 200+ other cryptocurrencies — no credit card or bank account required. New users even get $1 in free credits to test NVIDIA Nemotron 3 Ultra 550B risk-free before committing.
Pricing
| Token Type | Qubax | OpenRouter | You Save |
|---|---|---|---|
| Input (per 1M tokens) | $0.130 | $0.500 | 74% |
| Output (per 1M tokens) | $0.650 | $2.50 | 74% |
Prices per 1 million tokens. Pay with 200+ cryptocurrencies.
Estimated Monthly Cost
Specifications
Use Cases
Capabilities
Quick Start
from openai import OpenAI
client = OpenAI(
base_url="https://api.qubax.ai/v1",
api_key="qbx_live_YOUR_API_KEY",
)
response = client.chat.completions.create(
model="nvidia-nemotron-3-ultra-550b-a55b",
messages=[
{"role": "user", "content": "Hello!"}
],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.qubax.ai/v1",
apiKey: "qbx_live_YOUR_API_KEY",
});
const response = await client.chat.completions.create({
model: "nvidia-nemotron-3-ultra-550b-a55b",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);curl https://api.qubax.ai/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer qbx_live_YOUR_API_KEY" \
-d '{
"model": "nvidia-nemotron-3-ultra-550b-a55b",
"messages": [{"role": "user", "content": "Hello!"}]
}'Get your API key from the dashboard. New users get $1 free credits.
Why use NVIDIA Nemotron 3 Ultra 550B on Qubax?
74% Cheaper
Up to 74% off OpenRouter prices
Pay with Crypto
200+ coins (BTC, ETH, SOL, USDT, USDC & more). No credit card needed.
OpenAI Compatible
Drop-in replacement. Works with Cline, Cursor, any tool.
More from Other
Compare NVIDIA Nemotron 3 Ultra 550B with alternatives
| Model | Provider | Input / 1M | Output / 1M | vs NVIDIA Nemotron 3 Ultra 550B |
|---|---|---|---|---|
| NVIDIA Nemotron 3 Ultra 550B | Other | $0.130 | $0.650 | — |
| GPT 5 Mini | OpenAI | $0.242 | $1.94 | More expensive |
| Qwen 3.6 35B A3B (E2EE) | Alibaba | $0.213 | $0.639 | More expensive |
| GLM 4.5 | Zhipu AI | $0.078 | $0.286 | Cheaper |
| GLM 5.1 Non-thinking (Morpheus Web) | Zhipu AI | $0.195 | $0.650 | More expensive |
Frequently Asked Questions
How much does the NVIDIA Nemotron 3 Ultra 550B API cost?
On Qubax, NVIDIA Nemotron 3 Ultra 550B costs $0.130 per 1M input tokens and $0.650 per 1M output tokens. This is 74% cheaper than OpenRouter's price of $0.500 per 1M input tokens.
Is the NVIDIA Nemotron 3 Ultra 550B API compatible with OpenAI?
Yes. Qubax provides an OpenAI-compatible API. You can use NVIDIA Nemotron 3 Ultra 550B as a drop-in replacement by changing your base URL to https://api.qubax.ai/v1 and using your Qubax API key. It works with Cline, Cursor, OpenCode, Hermes Agent, and any tool that supports OpenAI APIs.
Why is NVIDIA Nemotron 3 Ultra 550B cheaper on Qubax than OpenRouter?
Qubax sources AI inference from the Surplus Intelligence marketplace, an open marketplace on the Base blockchain where compute providers compete on price. We pass the savings to you — 74% cheaper than OpenRouter's price for NVIDIA Nemotron 3 Ultra 550B.
How do I pay for NVIDIA Nemotron 3 Ultra 550B API usage?
Qubax uses prepaid crypto credits. Deposit USDC on the Base chain and your balance is automatically deducted as you use the API. New users get $1 in free credits to start. No credit card required.
What is the context window of NVIDIA Nemotron 3 Ultra 550B?
NVIDIA Nemotron 3 Ultra 550B supports a context window of 1M tokens, allowing you to process large documents, codebases, or long conversations in a single request.
What can I build with NVIDIA Nemotron 3 Ultra 550B?
NVIDIA Nemotron 3 Ultra 550B is versatile enough for a wide range of applications. You can use it to tackle complex multi-step reasoning tasks, build autonomous agents that call external tools and APIs, generate structured JSON output for data pipelines, process long documents and entire codebases, and more. Because it's served through Qubax's OpenAI-compatible API, integration into existing apps, agents, or workflows takes just a few lines of code.
How fast is NVIDIA Nemotron 3 Ultra 550B on Qubax?
NVIDIA Nemotron 3 Ultra 550B on Qubax supports streaming responses, so tokens begin arriving in real time as they're generated. Latency depends on the provider and prompt complexity, but most requests start streaming within 200–800 milliseconds. Qubax routes requests through the Surplus Intelligence marketplace, which selects the fastest available compute provider for each request — so you get competitive latency at a lower price.
NVIDIA Nemotron 3 Ultra 550B vs GPT 5 Mini: which should I choose?
NVIDIA Nemotron 3 Ultra 550B by Other and GPT 5 Mini by OpenAI are both strong models in a similar price tier. NVIDIA Nemotron 3 Ultra 550B excels at complex reasoning. GPT 5 Mini comes from a different lab and may have different strengths depending on your workload. On Qubax, NVIDIA Nemotron 3 Ultra 550B starts at $0.130/1M input tokens versus GPT 5 Mini's $0.242/1M — making NVIDIA Nemotron 3 Ultra 550B the more cost-effective option for high-volume workloads. Both are available on Qubax with crypto payments and OpenAI-compatible APIs, so you can try each and switch freely.
Can I use NVIDIA Nemotron 3 Ultra 550B for commercial projects?
Yes. NVIDIA Nemotron 3 Ultra 550B on Qubax can be used for commercial purposes. You own the outputs you generate. Qubax provides the API infrastructure — you bring your use case.
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