GPT-5.1-Codex-Max vs GPT-5.4 mini
OpenAI GPT-5.1-Codex-Max | OpenAI GPT-5.4 mini | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Nov 19 2025 | Mar 17 2026 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | — | 400k |
| 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. | — | 32% |
| Timeline | ||
| Release gap | GPT-5.1-Codex-Max shipped 118 days before GPT-5.4 mini | |
Which is better: GPT-5.1-Codex-Max or GPT-5.4 mini?
GPT-5.1-Codex-Max and GPT-5.4 mini 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 118 days before GPT-5.4 mini, 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-5.1-Codex-Max and GPT-5.4 mini don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5.1-Codex-Max was released by OpenAI on Nov 19 2025.
GPT-5.4 mini was released by OpenAI on Mar 17 2026.
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