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. | 72B | — |
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 | 2M |
| These models have no shared benchmark scores. | ||
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. | 60.4% | — |
| Overview | ||
| Company | Moonshot AI | SpaceXSI |
| Release date | Jun 17 2025 | Sep 19 2025 |
| Access | Open Weight | Closed |
| Model details | View model | View model |
Other comparisons
Kimi-DevvsClaude Haiku 5.5Grok 4 FastvsClaude Haiku 5.5Kimi-DevvsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolKimi-DevvsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonKimi-DevvsMuse Spark OpenGrok 4 FastvsMuse Spark OpenKimi-DevvsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Kimi-DevvsMistral Large 4Grok 4 FastvsMistral Large 4Frequently asked questions
Kimi-Dev and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi-Dev shipped 94 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (Kimi-Dev) vs 2M (Grok 4 Fast). Kimi-Dev is open weight, while Grok 4 Fast is closed.
Direct benchmark comparisons are unavailable — Kimi-Dev and Grok 4 Fast don't publish scores on any of the same benchmarks.