Grok 4.1 FastvsGrok 4.3 Beta
Grok 4.1 Fast | Grok 4.3 Beta | |
|---|---|---|
| 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. | 19% | 50% |
| Overview | ||
| Company | SpaceXAI | SpaceXAI |
| Release date | Nov 19 2025 | Apr 17 2026 |
| Access | Proprietary | Proprietary |
Frequently asked questions
Grok 4.3 Beta leads Grok 4.1 Fast on 1 of the 1 benchmark they both report (BullshitBench v2). Grok 4.1 Fast shipped 149 days before Grok 4.3 Beta, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, Grok 4.3 Beta leads at 50% vs Grok 4.1 Fast at 19%.
Grok 4.1 Fast was released by SpaceXAI on Nov 19 2025.
Grok 4.3 Beta was released by SpaceXAI on Apr 17 2026.
Other comparisons
Grok 4.1 FastvsClaude Opus 5Grok 4.3 BetavsClaude Opus 5Grok 4.1 FastvsGPT-5.6-CyberGrok 4.3 BetavsGPT-5.6-CyberGrok 4.1 FastvsGemini 3.7 FlashGrok 4.3 BetavsGemini 3.7 FlashGrok 4.1 FastvsMuse GlimmerGrok 4.3 BetavsMuse GlimmerGrok 4.1 FastvsDeepSeek-V4-Pro-0813Grok 4.3 BetavsDeepSeek-V4-Pro-0813Grok 4.1 FastvsMistral Medium 3.5Grok 4.3 BetavsMistral Medium 3.5