LLaMA 3.1vsGrok 4.1 Fast
LLaMA 3.1 | Grok 4.1 Fast | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $0.02DeepInfra | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $0.04DeepInfra | — |
| 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. | 14% | 19% |
| Overview | ||
| Company | Meta | SpaceXAI |
| Release date | Jul 23 2024 | Nov 19 2025 |
| Access | Open Weight | Proprietary |
Other comparisons
LLaMA 3.1vsClaude Fable 5.1Grok 4.1 FastvsClaude Fable 5.1LLaMA 3.1vsGPT-6 AstraGrok 4.1 FastvsGPT-6 AstraLLaMA 3.1vsGemini 3.8 FlashGrok 4.1 FastvsGemini 3.8 FlashLLaMA 3.1vsDeepSeek-V4.1-FlashGrok 4.1 FastvsDeepSeek-V4.1-FlashLLaMA 3.1vsMistral Medium 3.5Grok 4.1 FastvsMistral Medium 3.5LLaMA 3.1vsKimi K3Grok 4.1 FastvsKimi K3
Frequently asked questions
Grok 4.1 Fast leads LLaMA 3.1 on 1 of the 1 benchmark they both report (BullshitBench v2). LLaMA 3.1 shipped 484 days before Grok 4.1 Fast, so benchmark comparisons should account for the intervening progress.
LLaMA 3.1 is open weight, while Grok 4.1 Fast is proprietary.
On BullshitBench v2, Grok 4.1 Fast leads at 19% vs LLaMA 3.1 at 14%.