Compare AI models
| 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 |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $15.00Amazon Bedrock | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $75.00Amazon Bedrock | — |
| Benchmarks | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 80.9% | 76% |
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 43% | — |
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 74.5% | — |
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 | Anthropic | NVIDIA |
| Release date | Aug 5 2025 | Apr 8 2025 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Claude Opus 4.1vsGPT-6.1 SolLlama Nemotron Ultra 253BvsGPT-6.1 SolClaude Opus 4.1vsGemini 4 ArgonLlama Nemotron Ultra 253BvsGemini 4 ArgonClaude Opus 4.1vsMuse Spark 1.3Llama Nemotron Ultra 253BvsMuse Spark 1.3Claude Opus 4.1vsGrok 4.7Llama Nemotron Ultra 253BvsGrok 4.7Claude Opus 4.1vsDeepSeek-V4.1-FlashLlama Nemotron Ultra 253BvsDeepSeek-V4.1-FlashClaude Opus 4.1vsMistral Large 4Llama Nemotron Ultra 253BvsMistral Large 4Frequently asked questions
Claude Opus 4.1 leads Llama Nemotron Ultra 253B on 1 of the 1 benchmark they both report (GPQA Diamond). Llama Nemotron Ultra 253B shipped 119 days before Claude Opus 4.1, so benchmark comparisons should account for the intervening progress.
Claude Opus 4.1 is closed, while Llama Nemotron Ultra 253B is open weight.
On GPQA Diamond, Claude Opus 4.1 leads at 80.9% vs Llama Nemotron Ultra 253B at 76%.