GPT-4o mini vs GPT-5.1-Codex-Max
OpenAI GPT-4o mini | OpenAI GPT-5.1-Codex-Max | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Jul 18 2024 | 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. | 2% | — |
| Timeline | ||
| Release gap | GPT-4o mini shipped 489 days before GPT-5.1-Codex-Max | |
Which is better: GPT-4o mini or GPT-5.1-Codex-Max?
GPT-4o mini 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-4o mini shipped 489 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-4o mini and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-4o mini was released by OpenAI on Jul 18 2024.
GPT-5.1-Codex-Max was released by OpenAI on Nov 19 2025.
Other comparisons
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