What is the context window of Nvidia Nemotron Ultra 253B by NanoGPT?

Nvidia Nemotron Ultra 253B by NanoGPT has a context window of 128K tokens. It supports up to 128K input tokens and can generate up to 16K output tokens.

What input and output types does Nvidia Nemotron Ultra 253B support?

Nvidia Nemotron Ultra 253B by NanoGPT accepts text as input and can generate text as output.

Is Nvidia Nemotron Ultra 253B by NanoGPT open source?

No, Nvidia Nemotron Ultra 253B by NanoGPT has closed weights. The model is only available through the NanoGPT API.

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Nvidia Nemotron Ultra 253B API

NanoGPT

About

Process massive datasets with Nvidia Nemotron Ultra 253B, featuring an expansive 128K context window for long-document analysis. This model delivers cost-effective pricing at $0.40/1M input and $0.80/1M output tokens. Access Nvidia Nemotron Ultra 253B via the NanoGPT API with up to 16K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text

Reasoning

Structured Output

Tool Use

WeightsClosed

Temperature

Fixed

Attachment

Not Supported

Limits

Context Window

128K

Tokens

Input Limit

128K

Tokens

Max Output

16K

Tokens

Pricing

Standard (per 1M tokens)

Input

$0.40

Output

$0.80

Frequently Asked Questions

Nvidia Nemotron Ultra 253B by NanoGPT costs $0.40 per 1M input tokens and $0.80 per 1M output tokens.

Model Details

nvidia/Llama-3.1-Nemotron-Ultra-253B-v1

Provider

NanoGPT

Family

nemotron

Release Date

Jul 3, 2025

Knowledge Cutoff

N/A

API Integration

NPM Package

@ai-sdk/openai-compatible

Environment Variables

NANO_GPT_API_KEY

API Base URL

https://nano-gpt.com/api/v1

Documentation