DeepSeek DeepSeek-V4-Flash vs xAI Grok 4 Fast — side-by-side specs.
DeepSeek DeepSeek-V4-Flash | xAI Grok 4 Fast | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | xAI |
| Release date | Apr 24 2026 | Sep 2025 |
| Model type | — | — |
| Open source | Yes | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 88.1% | — |
| Timeline | ||
| Release gap | Grok 4 Fast shipped 235 days before DeepSeek-V4-Flash | |
DeepSeek-V4-Flash and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Fast shipped 235 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
DeepSeek-V4-Flash is an open-source / open-weight model; Grok 4 Fast is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek-V4-Flash and Grok 4 Fast don't publish scores on any of the same benchmarks.