DeepSeek-V4-FlashvsGPT-5.1-Codex-Max
DeepSeek-V4-Flash | GPT-5.1-Codex-Max | |
|---|---|---|
| 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-5.1-Codex-Max shipped 156 days before DeepSeek-V4-Flash | |
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | Apr 24 2026 | Nov 19 2025 |
| Access | Open Weight | Proprietary |
Which is better: DeepSeek-V4-Flash or GPT-5.1-Codex-Max?
DeepSeek-V4-Flash and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.1-Codex-Max shipped 156 days before DeepSeek-V4-Flash, so benchmark comparisons should account for the intervening progress.
DeepSeek-V4-Flash is open weight, while GPT-5.1-Codex-Max is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek-V4-Flash and GPT-5.1-Codex-Max 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-5.1-Codex-Max was released by OpenAI on Nov 19 2025.
DeepSeek-V4-Flash is an open weight model released by DeepSeek. GPT-5.1-Codex-Max is a proprietary model released by OpenAI.
Other comparisons
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