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 | 1T |
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 | $0.57Novita |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $1.00SiliconFlow | $2.30Novita |
| $104SiliconFlow · fp8 | $229Novita · fp8 | |
| Benchmarks | ||
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% | 65.8% |
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% | 75.1% |
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. | — | 10% |
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% | — |
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% | — |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | — | 4.7% |
| Overview | ||
| Company | DeepSeek | Moonshot AI |
| Release date | Sep 22 2025 | Jul 11 2025 |
| Access | Open Weight | Open Weight |
| Model details | View model | View model |
Other comparisons
DeepSeek V3.1 TerminusvsClaude Haiku 5.5Kimi K2vsClaude Haiku 5.5DeepSeek V3.1 TerminusvsGPT-6.1 SolKimi K2vsGPT-6.1 SolDeepSeek V3.1 TerminusvsGemini 4 ArgonKimi K2vsGemini 4 ArgonDeepSeek V3.1 TerminusvsMuse Spark OpenKimi K2vsMuse Spark OpenDeepSeek V3.1 TerminusvsGrok 4.7Kimi K2vsGrok 4.7DeepSeek V3.1 TerminusvsMistral Large 4Kimi K2vsMistral Large 4Frequently asked questions
DeepSeek V3.1 Terminus leads Kimi K2 on 2 of the 2 benchmarks they both report (SWE-Bench Verified, GPQA Diamond). Kimi K2 shipped 73 days before DeepSeek V3.1 Terminus, so benchmark comparisons should account for the intervening progress.
DeepSeek V3.1 Terminus has 671B parameters, while Kimi K2 has 1T. Context windows are 128k (DeepSeek V3.1 Terminus) vs 128k (Kimi K2).
On SWE-Bench Verified, DeepSeek V3.1 Terminus leads at 68.4% vs Kimi K2 at 65.8%. On GPQA Diamond, DeepSeek V3.1 Terminus leads at 80.7% vs Kimi K2 at 75.1%.