Compare AI models
| Specifications | ||
ParametersThe learned values that shape how a model responds. B means billion and T means trillion. For mixture-of-experts models, the total count is larger than the number active for each token. Parameter count alone does not measure quality. | 671B | 253B |
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 128k | 128k |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across every provider on OpenRouter, the lab included. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $0.27SiliconFlow | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $1.00SiliconFlow | — |
| $104SiliconFlow · fp8 | — | |
| Benchmarks | ||
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. | 74.9% | 66.3% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 80.7% | 76% |
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. | 68.4% | — |
SWE-Bench MultilingualMultilingual coding — Like SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | 57.8% | — |
| Overview | ||
| Company | DeepSeek | NVIDIA |
| Release date | Sep 22 2025 | Apr 8 2025 |
| Access | Open Weight | Open Weight |
| Model details | View model | View model |
Other comparisons
DeepSeek V3.1 TerminusvsClaude Haiku 5.5Llama Nemotron Ultra 253BvsClaude Haiku 5.5DeepSeek V3.1 TerminusvsGPT-6.1 SolLlama Nemotron Ultra 253BvsGPT-6.1 SolDeepSeek V3.1 TerminusvsGemini 4 ArgonLlama Nemotron Ultra 253BvsGemini 4 ArgonDeepSeek V3.1 TerminusvsMuse Spark OpenLlama Nemotron Ultra 253BvsMuse Spark OpenDeepSeek V3.1 TerminusvsGrok 4.7Llama Nemotron Ultra 253BvsGrok 4.7DeepSeek V3.1 TerminusvsMistral Large 4Llama Nemotron Ultra 253BvsMistral Large 4Frequently asked questions
DeepSeek V3.1 Terminus leads Llama Nemotron Ultra 253B on 2 of the 2 benchmarks they both report (LiveCodeBench, GPQA Diamond). Llama Nemotron Ultra 253B shipped 167 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.
DeepSeek V3.1 Terminus has 671B parameters, while Llama Nemotron Ultra 253B has 253B. Context windows are 128k (DeepSeek V3.1 Terminus) vs 128k (Llama Nemotron Ultra 253B).
On LiveCodeBench, DeepSeek V3.1 Terminus leads at 74.9% vs Llama Nemotron Ultra 253B at 66.3%. On GPQA Diamond, DeepSeek V3.1 Terminus leads at 80.7% vs Llama Nemotron Ultra 253B at 76%.