DeepSeek-V4-FlashvsGrok 4.1 Fast
DeepSeek-V4-Flash | Grok 4.1 Fast | |
|---|---|---|
| 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. | 18% | 19% |
| BenchmarksPublished by one model only | ||
LiveCodeBenchCompetitive coding — Coding problems published so recently the AI can't have seen them in training — a contamination-free test of raw programming skill. Higher is better. | 91.6% | — |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 88.1% | — |
Arena Elo (Code)Community preference (code) — Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1577 | — |
| Overview | ||
| Company | DeepSeek | SpaceXAI |
| Release date | Apr 24 2026 | Nov 19 2025 |
| Access | Open Weight | Proprietary |
Frequently asked questions
Grok 4.1 Fast leads DeepSeek-V4-Flash on 1 of the 1 benchmark they both report (BullshitBench v2). Grok 4.1 Fast shipped 156 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
DeepSeek-V4-Flash is open weight, while Grok 4.1 Fast is proprietary.
On BullshitBench v2, Grok 4.1 Fast leads at 19% vs DeepSeek-V4-Flash at 18%.
DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
Grok 4.1 Fast was released by SpaceXAI on Nov 19 2025.
DeepSeek-V4-Flash is an open weight model released by DeepSeek. Grok 4.1 Fast is a proprietary model released by SpaceXAI.
Other comparisons
DeepSeek-V4-FlashvsClaude Opus 5Grok 4.1 FastvsClaude Opus 5DeepSeek-V4-FlashvsGPT-5.6-CyberGrok 4.1 FastvsGPT-5.6-CyberDeepSeek-V4-FlashvsGemini 3.7 FlashGrok 4.1 FastvsGemini 3.7 FlashDeepSeek-V4-FlashvsMuse GlimmerGrok 4.1 FastvsMuse GlimmerDeepSeek-V4-FlashvsMistral Medium 3.5Grok 4.1 FastvsMistral Medium 3.5DeepSeek-V4-FlashvsKimi K3Grok 4.1 FastvsKimi K3