Compare AI models
These models have no shared benchmark scores. | ||
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. | — | 50% |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | — | 35% |
| Overview | ||
| Company | SpaceXAI | SpaceXAI |
| Release date | Sep 19 2025 | Apr 17 2026 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Grok 4 FastvsClaude Sonnet 5.5Grok 4.3 BetavsClaude Sonnet 5.5Grok 4 FastvsGPT-6.1 SolGrok 4.3 BetavsGPT-6.1 SolGrok 4 FastvsGemini 4 ArgonGrok 4.3 BetavsGemini 4 ArgonGrok 4 FastvsMuse Spark 1.3Grok 4.3 BetavsMuse Spark 1.3Grok 4 FastvsDeepSeek-V4.1-FlashGrok 4.3 BetavsDeepSeek-V4.1-FlashGrok 4 FastvsMistral Large 4Grok 4.3 BetavsMistral Large 4Frequently asked questions
Grok 4 Fast and Grok 4.3 Beta don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Fast shipped 210 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.
Direct benchmark comparisons are unavailable — Grok 4 Fast and Grok 4.3 Beta don't publish scores on any of the same benchmarks.