LLM Perks

Llama 3.1 Nemotron Ultra 253B

Free right now Frontier
Tool useOpen weights

Llama 3.1 Nemotron Ultra 253B is a language model with 253B parameters from NVIDIA. It is currently free at 1 provider with up to — tokens of context. The model supports tool calling. Its weights are open, so it can also run locally.

Developer
NVIDIA
Parameters
253B
Type
Text
License
Open weights

Where to use Llama 3.1 Nemotron Ultra 253B for free

Each row is a separate free endpoint with its own limits.

ProviderContextLimitCard
NVIDIA Build
nvidia/llama-3.1-nemotron-ultra-253b-v1
— Free serverless inference for development; limits and model availability may change. No Open

Quick start

curl https://integrate.api.nvidia.com/v1/chat/completions \
  -H "Authorization: Bearer $NVIDIA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "nvidia/llama-3.1-nemotron-ultra-253b-v1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Example for NVIDIA Build. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.

Benchmarks

Intelligence Index
7.5
GPQA Diamond
72.8%
Humanity's Last Exam
7.4%
Terminal-Bench Hard
2.3%
τ²-Bench
11.4%

Source: Artificial Analysis · Llama 3.1 Nemotron Ultra 253B v1 (Reasoning)

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FAQ

Is Llama 3.1 Nemotron Ultra 253B free?

Yes. As of September 26, 2026, Llama 3.1 Nemotron Ultra 253B is free at NVIDIA Build. Each provider has its own limits — see the table above.

How do I call Llama 3.1 Nemotron Ultra 253B via API?

Use any OpenAI-compatible client with base URL https://integrate.api.nvidia.com/v1, model ID nvidia/llama-3.1-nemotron-ultra-253b-v1, and a NVIDIA Build key.

How good is Llama 3.1 Nemotron Ultra 253B?

Artificial Analysis Intelligence Index: 7.5, GPQA Diamond: 73%. For comparison, the strongest free model in the catalog right now is GLM 5.3.

Is Llama 3.1 Nemotron Ultra 253B open-weight?

Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.