DeepSeek-V4-FlashvsGPT-5
DeepSeek-V4-Flash | GPT-5 | |
|---|---|---|
| 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% | 21%Best |
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% | — |
Community preference (code) Arena Elo (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. | — | 1394 |
| Timeline | ||
| Release gap | GPT-5 shipped 260 days before DeepSeek-V4-Flash | |
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | Apr 24 2026 | Aug 7 2025 |
| Access | Open Weight | Proprietary |
Which is better: DeepSeek-V4-Flash or GPT-5?
GPT-5 leads DeepSeek-V4-Flash on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5 shipped 260 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
DeepSeek-V4-Flash is open weight, while GPT-5 is proprietary.
On BullshitBench v2, GPT-5 leads at 21% vs DeepSeek-V4-Flash at 18%.
Frequently asked questions
DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
GPT-5 was released by OpenAI on Aug 7 2025.
DeepSeek-V4-Flash is an open weight model released by DeepSeek. GPT-5 is a proprietary model released by OpenAI.
Other comparisons
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