GPT-5-Codex vs GPT-5.1-Codex-Max
OpenAI GPT-5-Codex | OpenAI GPT-5.1-Codex-Max | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Sep 15 2025 | Nov 19 2025 |
| Access | Proprietary | 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 | GPT-5-Codex shipped 65 days before GPT-5.1-Codex-Max | |
Which is better: GPT-5-Codex or GPT-5.1-Codex-Max?
GPT-5-Codex 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-Codex shipped 65 days before GPT-5.1-Codex-Max, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — GPT-5-Codex and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5-Codex was released by OpenAI on Sep 15 2025.
GPT-5.1-Codex-Max was released by OpenAI on Nov 19 2025.
Other comparisons
GPT-5-Codex vs Claude Sonnet 5GPT-5.1-Codex-Max vs Claude Sonnet 5GPT-5-Codex vs Gemini OmniGPT-5.1-Codex-Max vs Gemini OmniGPT-5-Codex vs Muse Spark 1.1GPT-5.1-Codex-Max vs Muse Spark 1.1GPT-5-Codex vs Grok 4.5GPT-5.1-Codex-Max vs Grok 4.5GPT-5-Codex vs DeepSeek-V4-ProGPT-5.1-Codex-Max vs DeepSeek-V4-ProGPT-5-Codex vs Mistral Medium 3.5GPT-5.1-Codex-Max vs Mistral Medium 3.5