Kimi K2 vs Grok‑2
Moonshot AI Kimi K2 | xAI Grok‑2 | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | xAI |
| Release date | Jul 11 2025 | Aug 14 2024 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 1T | — |
Context window | 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% | — |
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% | — |
| Timeline | ||
| Release gap | Grok‑2 shipped 331 days before Kimi K2 | |
Which is better: Kimi K2 or Grok‑2?
Kimi K2 and Grok‑2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑2 shipped 331 days before Kimi K2, so benchmark comparisons should account for the intervening progress.
Kimi K2 is open weight, while Grok‑2 is proprietary.
Direct benchmark comparisons are unavailable — Kimi K2 and Grok‑2 don't publish scores on any of the same benchmarks.
Frequently asked questions
- When was Kimi K2 released?
- Kimi K2 was released by Moonshot AI on Jul 11 2025.
- When was Grok‑2 released?
- Grok‑2 was released by xAI on Aug 14 2024.
- Is Kimi K2 or Grok‑2 open source?
- Kimi K2 is an open weight model released by Moonshot AI. Grok‑2 is a proprietary model released by xAI.