Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) Intelligence, Performance & Price Analysis
Model summary
Intelligence
Artificial Analysis Intelligence Index
Speed
Output tokens per second
Input Price
USD per 1M tokens
Output Price
USD per 1M tokens
Verbosity
Output tokens from Intelligence Index
Metrics are compared against models of the same class:
- Non-reasoning models → compared only with other non-reasoning models
- Reasoning models → compared across both reasoning and non-reasoning
- Open weights models → compared only with other open weights models of the same size class:
- Tiny: ≤4B parameters
- Small: 4B–40B parameters
- Medium: 40B–150B parameters
- Large: >150B parameters
- Proprietary models → compared across proprietary and open weights models of the same price range, using a blended 3:1 input/output price ratio:
- <$0.15 per 1M tokens
- $0.15–$1 per 1M tokens
- >$1 per 1M tokens
| Reasoning | Yes This page shows the reasoning version of this model. A non-reasoning variant may also exist. |
|---|---|
| Input modality | Supports: text |
| Output modality | Supports: text |
| Context window | 128k ~192 A4 pages of size 12 Arial font |
| Total parameters | 253B |
| License | NVIDIA Open Model License Agreement |
| Model weights | Hugging Face |
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is among the least intelligent models and somewhat expensive when comparing to other open weight models of similar size. It's also notably slow and somewhat verbose. The model supports text input, outputs text, and has a 128k tokens context window.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) scores 15 on the Artificial Analysis Intelligence Index, placing it at the lower end among comparable models (averaging 27). When evaluating the Intelligence Index, it generated 47M tokens, which is somewhat verbose in comparison to the average of 17M.
Pricing for Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is $0.60 per 1M input tokens (somewhat expensive, average: $0.55) and $1.80 per 1M output tokens (somewhat expensive, average: $1.70). In total, it cost $486.79 to evaluate Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) on the Intelligence Index.
At 42 tokens per second, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is notably slow (57).
Intelligence
Artificial Analysis Intelligence Index
Artificial Analysis Intelligence Index by Open Weights / Proprietary
Intelligence Evaluations
Openness
Artificial Analysis Openness Index: Results
Intelligence Index Comparisons
Intelligence vs. Price
Intelligence Index Token Use & Cost
Output Tokens Used to Run Artificial Analysis Intelligence Index
Cost to Run Artificial Analysis Intelligence Index
Context Window
Context Window
Pricing
Pricing: Input and Output Prices
Intelligence vs. Price (Log Scale)
Pricing Comparison of Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) API Providers
Speed
Measured by Output Speed (tokens per second)
Output Speed
Output Speed vs. Price
Latency
Measured by Time (seconds) to First Token
Latency: Time To First Answer Token
End-to-End Response Time
Seconds to output 500 Tokens, calculated based on time to first token, 'thinking' time for reasoning models, and output speed
End-to-End Response Time
Model Size (Open Weights Models Only)
Model Size: Total and Active Parameters
Frequently Asked Questions
Common questions about Llama 3.1 Nemotron Ultra 253B v1 (Reasoning)
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) was released on April 7, 2025.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) was created by NVIDIA.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) scores 15 on the Artificial Analysis Intelligence Index, placing it at the lower end among other open weight models of similar size (median: 27).
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) generates output at 41.8 tokens per second (based on the median across providers serving the model), which is below average compared to other open weight models of similar size (median: 57.3 t/s).
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) has a time to first token (TTFT) of 2.51s (based on the median across providers serving the model), which is somewhat higher than average compared to other open weight models of similar size (median: 2.14s).
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) costs $0.60 per 1M input tokens (better than average, median: $0.60) and $1.80 per 1M output tokens (better than average, median: $2.20), based on the median across providers serving the model.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) costs $0.60 per 1M input tokens and $1.80 per 1M output tokens (based on the median across providers serving the model). For a blended rate (3:1 input to output ratio), this is $0.90 per 1M tokens. Pricing may vary by provider. Compare provider pricing
When evaluated on the Intelligence Index, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) generated 47M output tokens, which is somewhat higher than average compared to other open weight models of similar size (median: 17M).
Yes, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is a reasoning model. It uses extended thinking or chain-of-thought reasoning to work through complex problems before providing an answer.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) supports text input.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) supports text output.
No, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) does not support image input. It can only process text.
No, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is not multimodal. It only supports text input.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) has a context window of 130k tokens. This determines how much text and conversation history the model can process in a single request.
Yes, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is open weights. The model weights are publicly available and can be downloaded for self-hosting.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) has 253 billion parameters.
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is released under the NVIDIA Open Model License Agreement license. This license allows commercial use. View license
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) achieves a score of 15 on the Artificial Analysis Intelligence Index. This composite benchmark evaluates models across reasoning, knowledge, mathematics, and coding.
Yes, Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is available via API through 1 provider. Compare API providers
Llama 3.1 Nemotron Ultra 253B v1 (Reasoning) is available through 1 API provider. Compare providers