Claude 3 Opus vs Kimi K2 Thinking
Anthropic Claude 3 Opus | 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 | ||
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. | 33% | 71.3%Best |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 50.4% | — |
| Timeline | ||
| Release gap | Claude 3 Opus shipped 612 days before Kimi K2 Thinking | |
Which is better: Claude 3 Opus or Kimi K2 Thinking?
Kimi K2 Thinking leads Claude 3 Opus on 1 of the 1 benchmark they both report (SWE-Bench Verified). Claude 3 Opus shipped 612 days before Kimi K2 Thinking, so benchmark comparisons should account for the intervening progress.
Claude 3 Opus is proprietary, while Kimi K2 Thinking is open weight.
On SWE-Bench Verified, Kimi K2 Thinking leads at 71.3% vs Claude 3 Opus at 33%.
Frequently asked questions
Claude 3 Opus was released by Anthropic on Mar 4 2024.
Kimi K2 Thinking was released by Moonshot AI on Nov 6 2025.
Kimi K2 Thinking leads on SWE-Bench Verified — Claude 3 Opus 33% vs Kimi K2 Thinking 71.3%.
Claude 3 Opus 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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