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. | 200k | 128k |
| 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. | 72.5% | 60.4% |
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. | 34% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 79.6% | — |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | May 22 2025 | Jun 17 2025 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Claude Opus 4vsGPT-6.1 SolKimi-DevvsGPT-6.1 SolClaude Opus 4vsGemini 4 ArgonKimi-DevvsGemini 4 ArgonClaude Opus 4vsMuse Spark OpenKimi-DevvsMuse Spark OpenClaude Opus 4vsGrok 4.7Kimi-DevvsGrok 4.7Claude Opus 4vsDeepSeek-V4.1-Flash-1017Kimi-DevvsDeepSeek-V4.1-Flash-1017Claude Opus 4vsMistral Large 4Kimi-DevvsMistral Large 4Frequently asked questions
Claude Opus 4 leads Kimi-Dev on 1 of the 1 benchmark they both report (SWE-Bench Verified). Claude Opus 4 shipped 26 days before Kimi-Dev, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude Opus 4) vs 128k (Kimi-Dev). Claude Opus 4 is closed, while Kimi-Dev is open weight.
On SWE-Bench Verified, Claude Opus 4 leads at 72.5% vs Kimi-Dev at 60.4%.