Claude 3 Haiku vs Kimi K2 Thinking
Anthropic Claude 3 Haiku | Moonshot AI Kimi K2 Thinking | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Mar 4 2024 | Nov 6 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 1T |
Context window | — | 256k |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given 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% | — |
Coding SWE-Bench VerifiedReal 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% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 33.3% | — |
| Timeline | ||
| Release gap | Claude 3 Haiku shipped 612 days before Kimi K2 Thinking | |
Which is better: Claude 3 Haiku or Kimi K2 Thinking?
Claude 3 Haiku 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 Haiku shipped 612 days before Kimi K2 Thinking, so benchmark comparisons should account for the intervening progress.
Claude 3 Haiku is proprietary, while Kimi K2 Thinking is open weight.
Direct benchmark comparisons are unavailable — Claude 3 Haiku and Kimi K2 Thinking don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3 Haiku was released by Anthropic on Mar 4 2024.
Kimi K2 Thinking was released by Moonshot AI on Nov 6 2025.
Claude 3 Haiku is a proprietary model released by Anthropic. Kimi K2 Thinking is an open weight model released by Moonshot AI.
Other comparisons
Claude 3 Haiku vs GPT-5.6 SolKimi K2 Thinking vs GPT-5.6 SolClaude 3 Haiku vs Gemini OmniKimi K2 Thinking vs Gemini OmniClaude 3 Haiku vs Muse Spark 1.1Kimi K2 Thinking vs Muse Spark 1.1Claude 3 Haiku vs Grok 4.5Kimi K2 Thinking vs Grok 4.5Claude 3 Haiku vs DeepSeek-V4-ProKimi K2 Thinking vs DeepSeek-V4-ProClaude 3 Haiku vs Mistral Medium 3.5Kimi K2 Thinking vs Mistral Medium 3.5