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NVIDIA: Llama 3.1 Nemotron Ultra 253B

Flagship Nemotron model for high-throughput reasoning and complex agents

Source-linked nemotron Open weights Released 2025-04-07
API record Report
InputT
OutputT
Input priceNot listed
Output priceNot listed
Context128K
Max output8.192K
Providers2
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

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Providers offering Llama 3.1 Nemotron Ultra 253B
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
Nvidia nvidia/llama-3.1-nemotron-ultra-253b-v1 128K 16.384K ReasoningTools Docs ↗
DevPass (LLM Gateway) llama-3.1-nemotron-ultra-253b 128K 8.192K $0.6 $1.8 JSON Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $0.6/M

Across 1 priced provider

Median input $0.6/M

Midpoint of listed rates

Highest input $0.6/M

Same as the lowest listed rate

Output range $1.8 – $1.8

Per million output tokens

DevPass (LLM Gateway) $0.6/MLowest
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.
Specification

Capabilities

Recorded from the source catalog and provider listings.

Reasoning Yes
Tool calling Yes
? Structured output Unknown
× Attachments No
× Vision input No
Open weights Yes
Creator
NVIDIA
Model family
nemotron
Knowledge cutoff
Not documented
License
Not documented
Release date
2025-04-07
Model ID
nvidia/llama-3.1-nemotron-ultra-253b
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
No changes recorded

This record has not changed within the retained import history.

Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://model.kyssta.lol/api/v1/models/nvidia/llama-3.1-nemotron-ultra-253b
curl
curl "https://model.kyssta.lol/api/v1/models/nvidia/llama-3.1-nemotron-ultra-253b"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Llama 3.1 Nemotron Ultra 253B?

Flagship Nemotron model for high-throughput reasoning and complex agents. It is published by NVIDIA and catalogued here from Models.dev.

How much does Llama 3.1 Nemotron Ultra 253B cost?

Listed input pricing starts at $0.6 per million tokens from DevPass (LLM Gateway).

What is the context length of Llama 3.1 Nemotron Ultra 253B?

Llama 3.1 Nemotron Ultra 253B accepts up to 128K tokens of context and returns up to 8.192K output tokens.

Does Llama 3.1 Nemotron Ultra 253B support tool calling and structured output?

Provider catalogs list support for tool calling, and reasoning.

Which providers serve Llama 3.1 Nemotron Ultra 253B?

2 providers list this model: Nvidia, DevPass (LLM Gateway).

Are the weights for Llama 3.1 Nemotron Ultra 253B open?

Yes. The weights are published.

When was Llama 3.1 Nemotron Ultra 253B released?

The catalog records a release date of 2025-04-07, last verified Sep 11, 2026.

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