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. | 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. | $0.57Novita | — |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | $2.30Novita | — |
| $229Novita · fp8 | — | |
| These models have no shared benchmark scores. | ||
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 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. | 65.8% | — |
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% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.1% | — |
| Overview | ||
| Company | Moonshot AI | SpaceXSI |
| Release date | Jul 11 2025 | Aug 14 2024 |
| Access | Open Weight | Closed |
| Model details | View model | View model |
Other comparisons
Kimi K2vsClaude Haiku 5.5Grok‑2vsClaude Haiku 5.5Kimi K2vsGPT-6.1 SolGrok‑2vsGPT-6.1 SolKimi K2vsGemini 4 ArgonGrok‑2vsGemini 4 ArgonKimi K2vsMuse Spark OpenGrok‑2vsMuse Spark OpenKimi K2vsDeepSeek-V4.1-Flash-1017Grok‑2vsDeepSeek-V4.1-Flash-1017Kimi K2vsMistral Large 4Grok‑2vsMistral Large 4Frequently asked questions
Kimi K2 and Grok‑2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑2 shipped 331 days before Kimi K2, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (Kimi K2) vs 128k (Grok‑2). Kimi K2 is open weight, while Grok‑2 is closed.
Direct benchmark comparisons are unavailable — Kimi K2 and Grok‑2 don't publish scores on any of the same benchmarks.