NVIDIA: Llama 3.1 Nemotron Ultra 253B
Llama 3.1 Nemotron Ultra 253B is a reasoning model from NVIDIA released on Apr 7, 2025. It reads text and writes text, with a 128K token context window and up to 16K tokens per reply.
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It costs $0 per million input tokens and $0 per million output tokens.
It supports tool calling, and its weights are open, so you can host it yourself.
- Modalities
- In / out price
- $0 / $0 per 1M
- Context
- 128K
- Max output
- 16K
- Released
- Apr 7, 2025
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Llama 3.1 Nemotron Ultra 253B pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0 / 1M tokens | |
|---|---|---|
| Output | $0 / 1M tokens |
What Llama 3.1 Nemotron Ultra 253B costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Llama 3.1 Nemotron Ultra 253B through an OpenAI compatible API.
- Tools
tools - Reasoning
reasoning - Temperature
temperature
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Llama 3.1 Nemotron Ultra 253B questions
How much does the Llama 3.1 Nemotron Ultra 253B API cost?
$0 per million input tokens and $0 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Llama 3.1 Nemotron Ultra 253B?
128,000 tokens of input, and it can write up to 16,384 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Does Llama 3.1 Nemotron Ultra 253B support tool calling?
Yes. It accepts tool definitions, which is what an agent needs to call your APIs.
Is Llama 3.1 Nemotron Ultra 253B open source?
Its weights are published, so you can run it on your own hardware or a cloud of your choice. Read the license before commercial use.
When was Llama 3.1 Nemotron Ultra 253B released?
Apr 7, 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.
Building on Llama 3.1 Nemotron Ultra 253B?
I test your real tasks on it and the two closest alternatives, then ship the agent on whichever wins on cost and accuracy.
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