Kimi K2vsGrok 4.3 Beta
Kimi K2 | Grok 4.3 Beta | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | 1T | — |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 128k | — |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given 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% | 50% |
| BenchmarksPublished by one model only | ||
SWE-Bench VerifiedCoding — Real 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% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.1% | — |
| Overview | ||
| Company | Moonshot AI | SpaceXAI |
| Release date | Jul 11 2025 | Apr 17 2026 |
| Access | Open Weight | Proprietary |
Frequently asked questions
Grok 4.3 Beta leads Kimi K2 on 1 of the 1 benchmark they both report (BullshitBench v2). Kimi K2 shipped 280 days before Grok 4.3 Beta, so benchmark comparisons should account for the intervening progress.
Kimi K2 is open weight, while Grok 4.3 Beta is proprietary.
On BullshitBench v2, Grok 4.3 Beta leads at 50% vs Kimi K2 at 10%.
Kimi K2 was released by Moonshot AI on Jul 11 2025.
Grok 4.3 Beta was released by SpaceXAI on Apr 17 2026.
Kimi K2 is an open weight model released by Moonshot AI. Grok 4.3 Beta is a proprietary model released by SpaceXAI.
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