Grok 4 FastvsGrok‑1.5
Grok 4 Fast | Grok‑1.5 | |
|---|---|---|
| Overview | ||
| Company | SpaceXAI | SpaceXAI |
| Release date | Sep 19 2025 | Mar 29 2024 |
| Access | Proprietary | Proprietary |
Other comparisons
Grok 4 FastvsClaude Fable 5.1Grok‑1.5vsClaude Fable 5.1Grok 4 FastvsGPT-6 AstraGrok‑1.5vsGPT-6 AstraGrok 4 FastvsGemini 3.8 FlashGrok‑1.5vsGemini 3.8 FlashGrok 4 FastvsMuse Spark 1.3Grok‑1.5vsMuse Spark 1.3Grok 4 FastvsDeepSeek-V4.1-FlashGrok‑1.5vsDeepSeek-V4.1-FlashGrok 4 FastvsMistral Medium 3.5Grok‑1.5vsMistral Medium 3.5
Frequently asked questions
Grok 4 Fast and Grok‑1.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok‑1.5 shipped 539 days before Grok 4 Fast, 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‑1.5 don't publish scores on any of the same benchmarks.