GPT-4.1 MinivsGPT-5.1 Codex Max
GPT-5.1 Codex Max is the newer model, released after GPT-4.1 Mini.
| Spec | GPT-4.1 Mini | GPT-5.1 Codex Max |
|---|---|---|
| Input price | $0.4/M tokens | — |
| Output price | $1.6/M tokens | — |
| Context window | 1.0M tokens | — |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Apr 2025 | Dec 2025 |
Our Verdict
GPT-5.1 Codex Max
GPT-4.1 MiniRunner-up
Not enough votes to call it. On the specs, GPT-5.1 Codex Max has the edge: bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.1 Mini
Input
$0.40
Output
$1.60
GPT-5.1 Codex Max
Input
—
Output
—
Where to run it
3 hosts
GPT-4.1 Mini2 hosts
GPT-5.1 Codex Max1 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
44%
GPT-4.1 Mini uses 65.5x more emoji
GPT-4.1 Mini
GPT-5.1 Codex Max
62%Vocabulary60%
18wSentence Length16w
0.40Hedging0.36
4.1Bold2.3
4.3Lists4.2
0.66Emoji0.00
0.68Headings0.12
0.14Transitions0.03
Based on 27 + 13 text responses
Research
What we learned reading every model
FAQ
Common questions
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