Claude 2vsKimi K2 (0905)
Claude 2 | Kimi K2 (0905) | |
|---|---|---|
| Specifications | ||
Parameters | — | 1T |
Context window | 100k | 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. | — | 65.8% |
Function synthesis HumanEval164 small Python problems: the AI is given a function's description and has to write the working function. This was the coding benchmark of the GPT-3.5 and GPT-4 era, before the field moved to fixing real bugs in real repositories. Higher is better. | 71.2% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 75.1% |
General knowledge MMLUA 57-subject multiple-choice exam — history, law, medicine, maths — that was the standard measure of how much a model knows from 2020 until roughly 2024, when frontier scores crowded into the high 80s and labs moved on to harder tests. The scores here were published years apart under different testing setups, so read them as a historical record rather than a like-for-like ranking. Higher is better. | 78.5% | — |
Grade-school math GSM8KGrade-school maths word problems that take a few steps of arithmetic to work through. It separated the models of 2022 and 2023 sharply, then saturated. One caveat on the historical numbers: OpenAI included part of the GSM8K training set in GPT-4's pre-training mix, so GPT-4's score is not a clean few-shot result. Higher is better. | 88% | — |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Jul 11 2023 | Sep 5 2025 |
| Access | Proprietary | Open Weight |
Which is better: Claude 2 or Kimi K2 (0905)?
Claude 2 and Kimi K2 (0905) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 2 shipped 787 days before Kimi K2 (0905), so benchmark comparisons should account for the intervening progress.
Context windows are 100k (Claude 2) vs 256k (Kimi K2 (0905)). Claude 2 is proprietary, while Kimi K2 (0905) is open weight.
Direct benchmark comparisons are unavailable — Claude 2 and Kimi K2 (0905) don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 2 was released by Anthropic on Jul 11 2023.
Kimi K2 (0905) was released by Moonshot AI on Sep 5 2025.
Claude 2 has a 100k context window; Kimi K2 (0905) has 256k.
Claude 2 is a proprietary model released by Anthropic. Kimi K2 (0905) is an open weight model released by Moonshot AI.