Claude Instant 1.2vsKimi K2
Claude Instant 1.2 | Kimi K2 | |
|---|---|---|
| Specifications | ||
Parameters | — | 1T |
Context window | 100k | 128k |
| 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. | — | 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. | 58.7% | — |
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% |
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. | 86.7% | — |
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Aug 9 2023 | Jul 11 2025 |
| Access | Proprietary | Open Weight |
Which is better: Claude Instant 1.2 or Kimi K2?
Claude Instant 1.2 and Kimi K2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Instant 1.2 shipped 702 days before Kimi K2, so benchmark comparisons should account for the intervening progress.
Context windows are 100k (Claude Instant 1.2) vs 128k (Kimi K2). Claude Instant 1.2 is proprietary, while Kimi K2 is open weight.
Direct benchmark comparisons are unavailable — Claude Instant 1.2 and Kimi K2 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Instant 1.2 was released by Anthropic on Aug 9 2023.
Kimi K2 was released by Moonshot AI on Jul 11 2025.
Claude Instant 1.2 has a 100k context window; Kimi K2 has 128k.
Claude Instant 1.2 is a proprietary model released by Anthropic. Kimi K2 is an open weight model released by Moonshot AI.