Claude 3 HaikuvsKimi K2 (0905)
Claude 3 Haiku | Kimi K2 (0905) | |
|---|---|---|
| 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. | — | 256k |
| Benchmarks | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 33.3% | 75.1% |
| BenchmarksPublished by one model only | ||
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% |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Mar 4 2024 | Sep 5 2025 |
| Access | Proprietary | Open Weight |
Frequently asked questions
Kimi K2 (0905) leads Claude 3 Haiku on 1 of the 1 benchmark they both report (GPQA Diamond). Claude 3 Haiku shipped 550 days before Kimi K2 (0905), so benchmark comparisons should account for the intervening progress.
Claude 3 Haiku is proprietary, while Kimi K2 (0905) is open weight.
On GPQA Diamond, Kimi K2 (0905) leads at 75.1% vs Claude 3 Haiku at 33.3%.
Claude 3 Haiku was released by Anthropic on Mar 4 2024.
Kimi K2 (0905) was released by Moonshot AI on Sep 5 2025.
Kimi K2 (0905) leads on GPQA Diamond — Claude 3 Haiku 33.3% vs Kimi K2 (0905) 75.1%.
Claude 3 Haiku is a proprietary model released by Anthropic. Kimi K2 (0905) is an open weight model released by Moonshot AI.
Other comparisons
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