Llama-3.1-Nemotron-Ultra-253B — reviews, specs & pricing

Nvidia's reasoning-optimized derivative of Llama 3.1.

Summary

This model is a pruned and post-trained derivative of Llama 3.1 405B, optimized by Nvidia for reasoning tasks with toggleable reasoning mode. It supports a 128k context window. It's designed for high accuracy with reduced inference cost versus the original.

Sample use case

Used for enterprise reasoning tasks and as a base for further fine-tuning. Suited for teams wanting Llama-derived open weights with efficiency gains.

Specifications

  • Provider: nvidia
  • License: open
  • Parameters: 253B
  • Context: 128k tokens
  • Released: 2025-04-07

Pros

  • Reasoning toggle mode
  • More efficient than base 405B
  • Open weights

Cons

  • Still large for self-hosting
  • Derived model, dependent on Llama license
  • Less brand recognition

Average rating 0.0 from 0 community reviews on Reviuws.

Frequently asked questions

What is Llama-3.1-Nemotron-Ultra-253B?

This model is a pruned and post-trained derivative of Llama 3.1 405B, optimized by Nvidia for reasoning tasks with toggleable reasoning mode. It supports a 128k context window. It's designed for high accuracy with reduced inference cost versus the original.

How much does Llama-3.1-Nemotron-Ultra-253B cost?

Pricing for Llama-3.1-Nemotron-Ultra-253B is not publicly listed.

Is Llama-3.1-Nemotron-Ultra-253B open source?

Llama-3.1-Nemotron-Ultra-253B is released under the open license.