Claude Haiku 4.5 vs Kimi K2 Thinking
Anthropic Claude Haiku 4.5 | Moonshot AI Kimi K2 Thinking | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Oct 15 2025 | 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. | 77% | — |
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. | 73.3%Best | 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. | 73% | — |
| Timeline | ||
| Release gap | Claude Haiku 4.5 shipped 22 days before Kimi K2 Thinking | |
Which is better: Claude Haiku 4.5 or Kimi K2 Thinking?
Claude Haiku 4.5 leads Kimi K2 Thinking on 1 of the 1 benchmark they both report (SWE-Bench Verified). Claude Haiku 4.5 shipped 22 days before Kimi K2 Thinking, so benchmark comparisons should account for the intervening progress.
Claude Haiku 4.5 is proprietary, while Kimi K2 Thinking is open weight.
On SWE-Bench Verified, Claude Haiku 4.5 leads at 73.3% vs Kimi K2 Thinking at 71.3%.
Frequently asked questions
Claude Haiku 4.5 was released by Anthropic on Oct 15 2025.
Kimi K2 Thinking was released by Moonshot AI on Nov 6 2025.
Claude Haiku 4.5 leads on SWE-Bench Verified — Claude Haiku 4.5 73.3% vs Kimi K2 Thinking 71.3%.
Claude Haiku 4.5 is a proprietary model released by Anthropic. Kimi K2 Thinking is an open weight model released by Moonshot AI.
Other comparisons
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