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ModelCap

NVIDIA Nemotron 3 Ultra 550B A55B NVFP4

Current board #31Arena #96Restricted license

NVIDIA·nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4

NVIDIA Nemotron 3 Ultra 550B A55B NVFP4 is a language model published by NVIDIA. The latest OpenRouter endpoint refresh was unavailable, so no current serving claim is made. It accepts text input and returns text. The published context limit is 512K tokens. The catalogue declares support for tool use.

ModelCap Index · Current board
71.3#31
Measured · 76% support · score interval 71.3–79.1
Market Gravity
11.4
Secondary market signal

OpenRouter endpoint status could not be refreshed. This model is not treated as currently served until a successful observation arrives.

Input
$0.60
per 1M tokens
Output
$2.40
per 1M tokens
Context
512K
tokens
Providers
0
endpoints
Gateway spend
—
latest · Vercel share

Providers

Uptime measured over the last 30 minutes

Current provider status is unavailable.

Hugging Face Inference Providers

Exact repository identity

Provider economics and telemetry published by the Hugging Face Router. These are operational signals, not benchmark results.

ProviderInputOutputContextTTFTThroughputFeatures
fireworks-ai
live
$0.60$2.40262K383 ms83.1 tok/stools · structured
together
live
$0.60$3.60512K257 ms111.5 tok/stools · structured

Reported evaluation leads (5)

Excluded from score

Structured rows reported in this exact model repository at the pinned revision below. They are useful research leads, but remain quarantined until dataset revision, harness, configuration and identity pass ModelCap’s independent admission review.

Dataset / taskMetricValueRevisionProvenance
cais/hle
hle
—26.1
Unpinned
not published
Reported
Quarantined
cais/hle
hle
—37.4
Unpinned
not published
Reported
Quarantined
Idavidrein/gpqa
diamond
—87.9
Unpinned
not published
Reported
Quarantined
SWE-bench/SWE-bench_Verified
swe_bench_%_resolved
—69.7
Unpinned
not published
Reported
Quarantined
TIGER-Lab/MMLU-Pro
mmlu_pro
—86.8
Unpinned
not published
Reported
Quarantined

ModelCap Index · Current board

Methodology
71.3
Measured · 2 public benchmark observations across 2 boards
Current board
#31
Public rank basis
Measured (measured)
Index support
76.2% · strong
Index interval
71.3–79.1
Rank posterior
Not available
Top 5 / Top 10 probability
Not available / Not available
Posterior as of
Snapshot timestamp unavailable
Identity binding
Exact catalogue product · nvidia/nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4 · aggregates disclosed benchmark configurations · endpoint configuration not claimed · artifact metadata nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4@183968f87ae4cedce3039313cac1fd43d112c578 (not the evaluation revision)
Direct benchmark observations
2
Breadth-adjusted BES point estimate
75.2
Bayesian Evidence Score · measured evidence input only

BES normalizes admitted public benchmark evidence for measured Index rows. Its legacy score and observables prior do not define the public language rank.

Observed capability
75.2
Evidence status
confirmed · 81% mass
General preference
75.0
Coding
75.8
Agents & tools
—
Reasoning
—
Evidence breadth
92%
Evidence coverage
76%
Market and catalogue signals · secondary, never the language Index rank
Usage (OpenRouter popularity)
—
Liquidity (providers × uptime)
—
Open reach (HF downloads)
—
Surface (context / tools / modalities)
55.1
Freshness
78.0
  • · Catalogue: context 512288, tools
  • · First seen 2026-06-03

These adoption and deployment observations remain context only. They do not change this model's ModelCap Index score or rank.

BES evidence selected · measured input only

The bounded 0–100 capability score blends each source’s competitive placement with its published achievement, then combines capability families. Evidence breadth adds a modest uncertainty adjustment; price and popularity are not part of benchmark-led rank.

Deployment readiness

Metadata index
73.5
partial · 88% metadata coverage
Not capability
Artifact reproducibility
85.0
Access & legal clarity
92.5
Deployability
64.8
Evaluation provenance
50.1

Missing: artifactReproducibility.base-lineage, deployability.measured-provider-uptime, evaluationProvenance.evaluation-dataset-revisions.

A metadata completeness and deployability index—not a safety certification, quality grade, or production-readiness claim.

Market activity

Venue coverage
Market Gravity
11.4
OpenRouter weekly popularity
Not listed

Market Gravity uses OpenRouter’s full-catalogue popularity order. Sparse Vercel top-ten observations appear only when published and do not affect the score.

Arena preference

Status
Ranked
Source
Arena
Official rank
#96 of 385
Rating
1426.0
95% confidence interval
1419–1433
Votes
11K
Source snapshot
6 Aug 2026, 13:00 UTC
Category
overall
Identity match confidence
100%

Market Gravity breakdown

Usage55%
0.0

OpenRouter weekly popularity across the full model catalogue.

Liquidity25%
0.0

Independent providers versus the model's open or closed cohort, weighted by uptime.

Open reach15%
50.0

Hugging Face 30-day downloads for open models; neutral for closed models.

Freshness5%
78.0

Time since first public availability, on a six-month half-life.

Specification

Context window
512K tokens
Max output
—
Inputs
Text
Outputs
Text
Tokenizer
—
Cached input tokens
Not offered
First seen on OpenRouter
3 Jun 2026

Capabilities

  • Not supported: Reasoning
  • Supported: Tool use
  • Not supported: Structured output
  • Not supported: Response format
  • Not supported: Moderated

Weights & access

Restricted license. Downloadable weights use a model-specific or use-restricted license. Review the linked license before use, redistribution, or commercial deployment.

Access
Restricted license
Licence
openmdw-1.1
Pinned revision
183968f87ae4
Parameters
335.0B
Architecture
NemotronHForCausalLM
Model type
nemotron_h
Hugging Face downloads (30d)
209K
Downloads (all time)
768K
Likes
282
Repository
nvidia/NVIDIA-Nemotron-3-Ultra-550B-A55B-NVFP4
Repository updated
24 Jun 2026, 19:23 UTC