xAI Grok 4 Fast vs xAI Grok‑1 — side-by-side specs.
xAI Grok 4 Fast | xAI Grok‑1 | |
|---|---|---|
| Overview | ||
| Company | xAI | xAI |
| Release date | Sep 2025 | Nov 3 2023 |
| Model type | — | — |
| Open source | No | Yes |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | — | — |
Software engineering SWE-Bench Verified | — | — |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | Grok‑1 shipped 668 days before Grok 4 Fast | |
Grok 4 Fast and Grok‑1 do not have directly comparable benchmark scores published on GPQA Diamond, SWE-Bench Verified, or MMMU. Grok‑1 shipped 668 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Grok‑1 is an open-source / open-weight model; Grok 4 Fast is proprietary.
Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.