Nemotron 3 Ultra

Name: NVIDIA: Nemotron 3 Ultra
Brand: nvidia
SKU: nvidia/nemotron-3-ultra-550b-a55b
Price: 0.66 USD
Availability: InStock

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

NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE).

$0.66 in · $2.64 out per 1M tokens262k contextJun 4, 2026

about 0.2¢ a message

A typical message: about 500 tokens you send and 500 it writes.

Chat with Nemotron 3 Ultra

Call it from code Lock this price

Also:free

Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $0.66provider $0.60
Output, per 1M tokens: $2.64provider $2.40
Cached input, per 1M: $0.132provider $0.12
Margin: +10%

Context and formats

Context window: 262,144 tokens
Longest answer: 182,520 tokens
Reads: text
Makes: text
First listed: 2026-06-04

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=nvidia/nemotron-3-ultra-550b-a55b.

About

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...

In NVIDIA's words.

Try it here

Cmd+Enter sends

The answer appears here.

Measured here

We could not load the measurements. Try again.

Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "nvidia/nemotron-3-ultra-550b-a55b", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

Embed this

A badge showing this model's live price per million tokens, as billed here, for a README or a site. It links back to this page.

<a href="https://useantimatter.com/planet/nvidia/nemotron-3-ultra-550b-a55b"><img src="https://useantimatter.com/api/badge/price?id=nvidia%2Fnemotron-3-ultra-550b-a55b" alt="Nemotron 3 Ultra price on Antimatter" height="28"></a>

Similar models from other labs

Closest in price and memory, from other labs.

Go back to the map, or take this model into a chat.