DeepSeek-V4-Flash vs Grok 4 Heavy
DeepSeek DeepSeek-V4-Flash | SpaceXAI Grok 4 Heavy | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | SpaceXAI |
| Release date | Apr 24 2026 | Jul 9 2025 |
| Access | Open Weight | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given 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% | — |
Competitive coding LiveCodeBenchCoding 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% | — |
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 Heavy shipped 289 days before DeepSeek-V4-Flash | |
Which is better: DeepSeek-V4-Flash or Grok 4 Heavy?
DeepSeek-V4-Flash and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Heavy shipped 289 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
DeepSeek-V4-Flash is open weight, while Grok 4 Heavy is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek-V4-Flash and Grok 4 Heavy don't publish scores on any of the same benchmarks.
Frequently asked questions
DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
Grok 4 Heavy was released by SpaceXAI on Jul 9 2025.
DeepSeek-V4-Flash is an open weight model released by DeepSeek. Grok 4 Heavy is a proprietary model released by SpaceXAI.
Other comparisons
DeepSeek-V4-Flash vs Claude Sonnet 5Grok 4 Heavy vs Claude Sonnet 5DeepSeek-V4-Flash vs GPT-5.6 SolGrok 4 Heavy vs GPT-5.6 SolDeepSeek-V4-Flash vs Gemini OmniGrok 4 Heavy vs Gemini OmniDeepSeek-V4-Flash vs Muse Spark 1.1Grok 4 Heavy vs Muse Spark 1.1DeepSeek-V4-Flash vs Mistral Medium 3.5Grok 4 Heavy vs Mistral Medium 3.5DeepSeek-V4-Flash vs Kimi K2.7 CodeGrok 4 Heavy vs Kimi K2.7 Code