Meta LLaMA 3.1 vs xAI Grok 4 Fast — side-by-side specs.
Meta LLaMA 3.1 | xAI Grok 4 Fast | |
|---|---|---|
| Overview | ||
| Company | Meta | xAI |
| Release date | Jul 23 2024 | Sep 2025 |
| Model type | — | — |
| Open source | Yes | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
| Timeline | ||
| Release gap | LLaMA 3.1 shipped 405 days before Grok 4 Fast | |
LLaMA 3.1 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. LLaMA 3.1 shipped 405 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
LLaMA 3.1 is an open-source / open-weight model; Grok 4 Fast is proprietary.
Direct benchmark comparisons are unavailable — LLaMA 3.1 and Grok 4 Fast don't publish scores on any of the same benchmarks.