GPT-4.1vsGPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini is cheaper than GPT-4.1 at $1.5/M vs $2/M input tokens.
| Spec | GPT-4.1 | GPT-5.1-Codex-Mini |
|---|---|---|
| Input price | $2/M tokens | $1.5/M tokens |
| Output price | $8/M tokens | $6/M tokens |
| Context window | 1.0M tokens | 400K tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Apr 2025 | Nov 2025 |
Our Verdict
GPT-4.1
GPT-5.1-Codex-Mini
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.1
Input
$2.00
Output
$8.00
GPT-5.1-Codex-Mini
Input
$1.50
1.3× cheaper
Output
$6.00
1.3× cheaper
GPT-5.1-Codex-Mini is cheaper on both: 1.3× input, 1.3× output.
Where to run it
3 hosts
GPT-5.1-Codex-Mini1 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
38%
GPT-4.1 uses 21.9x more emoji
GPT-4.1
GPT-5.1-Codex-Mini
58%Vocabulary68%
19wSentence Length19w
0.49Hedging0.64
8.8Bold2.7
5.8Lists2.6
0.22Emoji0.00
1.01Headings0.10
0.10Transitions0.06
Based on 27 + 17 text responses
Research
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FAQ
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