DeepSeek V3 Chat vs GPT-5-Codex
DeepSeek DeepSeek V3 Chat | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | Dec 2024 | Sep 15 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. | — | 39% |
| Timeline | ||
| Release gap | DeepSeek V3 Chat shipped 288 days before GPT-5-Codex | |
Which is better: DeepSeek V3 Chat or GPT-5-Codex?
DeepSeek V3 Chat and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V3 Chat shipped 288 days before GPT-5-Codex, so benchmark comparisons should account for the intervening progress.
DeepSeek V3 Chat is open weight, while GPT-5-Codex is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek V3 Chat and GPT-5-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
DeepSeek V3 Chat was released by DeepSeek on Dec 2024.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
DeepSeek V3 Chat is an open weight model released by DeepSeek. GPT-5-Codex is a proprietary model released by OpenAI.
Other comparisons
DeepSeek V3 Chat vs Claude Sonnet 5GPT-5-Codex vs Claude Sonnet 5DeepSeek V3 Chat vs Gemini OmniGPT-5-Codex vs Gemini OmniDeepSeek V3 Chat vs Muse Spark 1.1GPT-5-Codex vs Muse Spark 1.1DeepSeek V3 Chat vs Grok 4.5GPT-5-Codex vs Grok 4.5DeepSeek V3 Chat vs Mistral Medium 3.5GPT-5-Codex vs Mistral Medium 3.5DeepSeek V3 Chat vs Kimi K2.7 CodeGPT-5-Codex vs Kimi K2.7 Code