Nemotron 3 Ultra 550B A55B

Nemotron 3 Ultra is NVIDIA's open-weight language model for reasoning, coding, and coordinating tasks through tools.

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input · usd / 1m tok

$0.60

output · usd / 1m tok

$2.40

context window

262.14ktokens

modalities · in → out

pricing

base api ratesusd per 1m tokens

input: $0.60
output: $2.40
cache read: $0.12

providers

Fireworks hosts Nemotron 3 Ultra 550B A55B. Impossibl routes your request intelligently and handles failover automatically when a provider is down.

Fireworks

specifications

takes text in, gives text outnvidia/nemotron-3-ultra-550b-a55b

creatorNVIDIA
model typeText generation
context window262,144 tokens
maximum outputnot published
input
takes text in, gives text out
outputtext
tool callingnot verified
endpoint/v1/chat/completions

unknown means the public catalog does not establish that fact. a model's documented capabilities can differ from what a particular api supports. see the model documentation for integration details.

try it · your prompt, this model, live

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="nvidia/nemotron-3-ultra-550b-a55b",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

# responses API
import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["IMPOSSIBL_API_KEY"],
    base_url="https://api.impossibl.com/v1",
)

resp = client.responses.create(
    model="nvidia/nemotron-3-ultra-550b-a55b",
    input="▌",
)
print(resp.output_text)

edit the prompt, then run

benchmarks

benchmark results are not available for this model yet.

compare Nemotron 3 Ultra 550B A55B with other models

frontier labs and open weights, best-ranked firstusd / 1m tok · in / out

anthropic/claude-fable-5-1$10.00 / $50.00compare →
openai/gpt-6-astra$10.00 / $50.00compare →
meta/muse-spark-1.3$1.25 / $4.25compare →
zai/glm-5.3$1.40 / $4.40compare →

impossibl models --all →

frequently asked questions

What is Nemotron 3 Ultra 550B A55B?

Nemotron 3 Ultra is NVIDIA's open-weight language model for reasoning, coding, and coordinating tasks through tools. Its hybrid architecture combines attention with state-space and mixture-of-experts layers, and applications can turn reasoning on or off.

How much does Nemotron 3 Ultra 550B A55B cost?

Nemotron 3 Ultra 550B A55B costs $0.60 per million input tokens and $2.40 per million output tokens through the Impossibl API. Cache reads cost $0.12 per million tokens. All rates are in USD.

view the pricing table ↑

What is the context length of Nemotron 3 Ultra 550B A55B?

Nemotron 3 Ultra 550B A55B has a 262,144-token context window through the Impossibl API.

What inputs and outputs does Nemotron 3 Ultra 550B A55B support?

Nemotron 3 Ultra 550B A55B accepts text as input. Nemotron 3 Ultra 550B A55B returns text.

How do I use Nemotron 3 Ultra 550B A55B through an API?

Nemotron 3 Ultra 550B A55B is available through the Impossibl API. Use nvidia/nemotron-3-ultra-550b-a55b as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

follow the api quickstart →

this page describes Nemotron 3 Ultra 550B A55B as listed by the impossibl public api. prices and availability come from that catalog, refreshed here every five minutes. this is an impossibl offering, not a comparison of independent hosting-provider quotes. model descriptions and release dates, where available, use the creator sources linked under the answers above.

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