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llama-3.1-nemotron-ultra-253b-v1 Free API on NVIDIA NIM

Free API Verified
Available from NVIDIA NIM
Catalog profile Reasoning provider catalog metadata

NVIDIA Nemotron Ultra 253B is NVIDIA's largest custom model based on Llama 3.1 architecture, free on NVIDIA NIM — note this model has been reported as unavailable with standard API keys (status: unavailable).

Free APIOpenAI compatibleReasoningTool callingTextReasoning
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API Details

Copy-ready connection details

Use these values in your client or SDK.
Base URL
https://integrate.api.nvidia.com/v1
Model ID
nvidia/llama-3.1-nemotron-ultra-253b-v1
API format OpenAI Chat Completions
Technical Details

llama-3.1-nemotron-ultra-253b-v1 specifications

Provider catalog
Context window 131K
Max output 8K
Status Online
Family nemotron
Released Apr 7, 2025
Last updated Aug 6, 2026
Free listing since Apr 7, 2025
Input text, reasoning
Output text
Capabilities reasoning, tool calling
Open weights Yes
AI Recommendation

Should you use llama-3.1-nemotron-ultra-253b-v1?

llama-3.1-nemotron-ultra-253b-v1 is listed for chat, reasoning workloads and supports a 131K context window.

Use it when NVIDIA NIM's free tier is enough for evaluation, demos, or light production traffic.

Best for
  • Chat
  • Reasoning
Strengths & Weaknesses

Strengths

  • Strong reasoning profile
  • Long context window
  • Reasoning mode listed
  • Tool calling support

Watch outs

  • Free-tier rate limits apply
  • Vision support is not listed
Pricing

llama-3.1-nemotron-ultra-253b-v1 pricing per 1M tokens

Free tier listed
Input $0 per 1M tokens
Output $0 per 1M tokens
Free access Available NVIDIA NIM
Rate limit Up to 40 RPM provider policy
Typical Use Cases

llama-3.1-nemotron-ultra-253b-v1 use cases

Chat

llama-3.1-nemotron-ultra-253b-v1 is tagged for chat in this catalog and works with OpenAI-compatible client libraries.

Reasoning

llama-3.1-nemotron-ultra-253b-v1 is tagged for reasoning in this catalog and works with OpenAI-compatible client libraries.

FAQ

llama-3.1-nemotron-ultra-253b-v1 free API FAQ

Is llama-3.1-nemotron-ultra-253b-v1 free to use?

llama-3.1-nemotron-ultra-253b-v1 is listed with free API access on NVIDIA NIM, subject to the provider's quota and account policy.

What is the llama-3.1-nemotron-ultra-253b-v1 model ID?

The model ID shown in this catalog is nvidia/llama-3.1-nemotron-ultra-253b-v1.

What are the llama-3.1-nemotron-ultra-253b-v1 free tier rate limits on NVIDIA NIM?

The listed free tier limit is Up to 40 RPM. Limits can change per account tier, so confirm against the provider dashboard.

What context window does llama-3.1-nemotron-ultra-253b-v1 support?

The listed context window is 131K tokens with up to 8K output tokens.

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More about llama-3.1-nemotron-ultra-253b-v1

NVIDIA Nemotron Ultra 253B is NVIDIA's largest custom model based on Llama 3.1 architecture, free on NVIDIA NIM — note this model has been reported as unavailable with standard API keys (status: unavailable). When accessible, it offers 253B-parameter scale reasoning. Check model status on freellm.net before integration. Up to 40 RPM, OpenAI-compatible; requires Developer Program membership.

For API keys, setup steps, and provider-level limits, see the NVIDIA NIM provider page.