Llama Nemotron Ultra 253Bvso1
Llama Nemotron Ultra 253B | o1 | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | 253B | — |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | — | 200k |
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | — | $15.00 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | — | $60.00 |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | — | $7.50 |
| Benchmarks | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 76% | 75.7% |
| BenchmarksPublished by one model only | ||
LiveCodeBenchCompetitive coding — Coding problems published so recently the AI can't have seen them in training — a contamination-free test of raw programming skill. Higher is better. | 66.3% | — |
| Overview | ||
| Company | NVIDIA | OpenAI |
| Release date | Apr 8 2025 | Dec 5 2024 |
| Access | Open Weight | Proprietary |
Other comparisons
Frequently asked questions
Llama Nemotron Ultra 253B leads o1 on 1 of the 1 benchmark they both report (GPQA Diamond). Only o1 has a verified first-party API price: $15.00 per million input tokens and $60.00 per million output tokens. No pay-as-you-go API rate is tracked for Llama Nemotron Ultra 253B. o1 shipped 124 days before Llama Nemotron Ultra 253B, so benchmark comparisons should account for the intervening progress.
Llama Nemotron Ultra 253B is open weight, while o1 is proprietary.
On GPQA Diamond, Llama Nemotron Ultra 253B leads at 76% vs o1 at 75.7%.
Llama Nemotron Ultra 253B was released by NVIDIA on Apr 8 2025.
o1 was released by OpenAI on Dec 5 2024.
Llama Nemotron Ultra 253B leads on GPQA Diamond — Llama Nemotron Ultra 253B 76% vs o1 75.7%.
Only o1 has a verified first-party API price: $15.00 per million input tokens and $60.00 per million output tokens. No pay-as-you-go API rate is tracked for Llama Nemotron Ultra 253B. Rates are pay-as-you-go API prices verified on August 18, 2026.
Llama Nemotron Ultra 253B is an open weight model released by NVIDIA. o1 is a proprietary model released by OpenAI.