DeepSeek-V4-FlashvsGPT-5-Codex-Mini
DeepSeek-V4-Flash | GPT-5-Codex-Mini | |
|---|---|---|
| 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 | GPT-5-Codex-Mini shipped 168 days before DeepSeek-V4-Flash | |
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | Apr 24 2026 | Nov 7 2025 |
| Access | Open Weight | Proprietary |
Which is better: DeepSeek-V4-Flash or GPT-5-Codex-Mini?
DeepSeek-V4-Flash and GPT-5-Codex-Mini don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex-Mini shipped 168 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
DeepSeek-V4-Flash is open weight, while GPT-5-Codex-Mini is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek-V4-Flash and GPT-5-Codex-Mini don't publish scores on any of the same benchmarks.
Frequently asked questions
DeepSeek-V4-Flash was released by DeepSeek on Apr 24 2026.
GPT-5-Codex-Mini was released by OpenAI on Nov 7 2025.
DeepSeek-V4-Flash is an open weight model released by DeepSeek. GPT-5-Codex-Mini is a proprietary model released by OpenAI.
Other comparisons
DeepSeek-V4-FlashvsClaude Sonnet 5GPT-5-Codex-MinivsClaude Sonnet 5DeepSeek-V4-FlashvsGemini 3.6 FlashGPT-5-Codex-MinivsGemini 3.6 FlashDeepSeek-V4-FlashvsMuse Spark 1.1GPT-5-Codex-MinivsMuse Spark 1.1DeepSeek-V4-FlashvsGrok 4.5GPT-5-Codex-MinivsGrok 4.5DeepSeek-V4-FlashvsMistral Medium 3.5GPT-5-Codex-MinivsMistral Medium 3.5DeepSeek-V4-FlashvsKimi K3GPT-5-Codex-MinivsKimi K3