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. | — | 1T |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 128k | 256k |
| 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. | — | $0.60Novita |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | — | $2.50Novita |
| — | $245Novita · fp8 | |
| 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. | — | 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. | — | 75.1% |
| Overview | ||
| Company | Moonshot AI | Moonshot AI |
| Release date | Jan 20 2025 | Sep 5 2025 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Kimi K1.5vsClaude Haiku 5.5Kimi K2 (0905)vsClaude Haiku 5.5Kimi K1.5vsGPT-6.1 SolKimi K2 (0905)vsGPT-6.1 SolKimi K1.5vsGemini 4 ArgonKimi K2 (0905)vsGemini 4 ArgonKimi K1.5vsMuse WonderKimi K2 (0905)vsMuse WonderKimi K1.5vsGrok 4.7Kimi K2 (0905)vsGrok 4.7Kimi K1.5vsDeepSeek-V4.1-FlashKimi K2 (0905)vsDeepSeek-V4.1-FlashFrequently asked questions
Kimi K1.5 and Kimi K2 (0905) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K1.5 shipped 228 days before Kimi K2 (0905), so benchmark comparisons should account for the intervening progress.
Context windows are 128k (Kimi K1.5) vs 256k (Kimi K2 (0905)). Kimi K1.5 is closed, while Kimi K2 (0905) is open weight.
Direct benchmark comparisons are unavailable — Kimi K1.5 and Kimi K2 (0905) don't publish scores on any of the same benchmarks.