Kimi K2.6 vs Grok 4.20 Beta
Moonshot AI Kimi K2.6 | SpaceXAI Grok 4.20 Beta | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | SpaceXAI |
| Release date | Apr 21 2026 | Feb 17 2026 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 1T | — |
Context window | 256k | — |
| 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. | 65%Best | 56% |
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. | 80.2% | — |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 47.6% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 67% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 90.5% | — |
| Timeline | ||
| Release gap | Grok 4.20 Beta shipped 63 days before Kimi K2.6 | |
Which is better: Kimi K2.6 or Grok 4.20 Beta?
Kimi K2.6 leads Grok 4.20 Beta on 1 of the 1 benchmark they both report (BullshitBench v2). Grok 4.20 Beta shipped 63 days before Kimi K2.6, so benchmark comparisons should account for the intervening progress.
Kimi K2.6 is open weight, while Grok 4.20 Beta is proprietary.
On BullshitBench v2, Kimi K2.6 leads at 65% vs Grok 4.20 Beta at 56%.
Frequently asked questions
Kimi K2.6 was released by Moonshot AI on Apr 21 2026.
Grok 4.20 Beta was released by SpaceXAI on Feb 17 2026.
Kimi K2.6 is an open weight model released by Moonshot AI. Grok 4.20 Beta is a proprietary model released by SpaceXAI.
Other comparisons
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