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. | 200k | 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. | — | $0.60Google |
Cheapest outputLowest output rate across every provider on OpenRouter, the lab included. May come from a different provider than the cheapest input. | — | $2.50Google |
| — | $245Novita · bf16 | |
| 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. | — | 71.3% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 40.4% | — |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Mar 4 2024 | Nov 6 2025 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Claude 3 SonnetvsGPT-6.1 SolKimi K2 ThinkingvsGPT-6.1 SolClaude 3 SonnetvsGemini 4 ArgonKimi K2 ThinkingvsGemini 4 ArgonClaude 3 SonnetvsMuse Spark OpenKimi K2 ThinkingvsMuse Spark OpenClaude 3 SonnetvsGrok 4.7Kimi K2 ThinkingvsGrok 4.7Claude 3 SonnetvsDeepSeek-V4.1-Flash-1017Kimi K2 ThinkingvsDeepSeek-V4.1-Flash-1017Claude 3 SonnetvsMistral Large 4Kimi K2 ThinkingvsMistral Large 4Frequently asked questions
Claude 3 Sonnet and Kimi K2 Thinking don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3 Sonnet shipped 612 days before Kimi K2 Thinking, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude 3 Sonnet) vs 256k (Kimi K2 Thinking). Claude 3 Sonnet is closed, while Kimi K2 Thinking is open weight.
Direct benchmark comparisons are unavailable — Claude 3 Sonnet and Kimi K2 Thinking don't publish scores on any of the same benchmarks.