DeepSeek R1-0528 vs GPT-5-Codex
DeepSeek DeepSeek R1-0528 | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | May 28 2025 | 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. | 8% | 39%Best |
| Timeline | ||
| Release gap | DeepSeek R1-0528 shipped 110 days before GPT-5-Codex | |
Which is better: DeepSeek R1-0528 or GPT-5-Codex?
GPT-5-Codex leads DeepSeek R1-0528 on 1 of the 1 benchmark they both report (BullshitBench v2). DeepSeek R1-0528 shipped 110 days before GPT-5-Codex, so benchmark comparisons should account for the intervening progress.
DeepSeek R1-0528 is open weight, while GPT-5-Codex is proprietary.
On BullshitBench v2, GPT-5-Codex leads at 39% vs DeepSeek R1-0528 at 8%.
Frequently asked questions
DeepSeek R1-0528 was released by DeepSeek on May 28 2025.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
DeepSeek R1-0528 is an open weight model released by DeepSeek. GPT-5-Codex is a proprietary model released by OpenAI.
Other comparisons
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