GPT-5.4 NanovsMistral Medium 3.1
GPT-5.4 Nano is cheaper than Mistral Medium 3.1 at $0.2/M vs $0.4/M input tokens.
| Spec | GPT-5.4 Nano | Mistral Medium 3.1 |
|---|---|---|
| Input price | $0.2/M tokens | $0.4/M tokens |
| Output price | $1.25/M tokens | $2/M tokens |
| Context window | 400K tokens | 131K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Mar 2026 | Aug 2025 |
Our Verdict
GPT-5.4 Nano
Mistral Medium 3.1
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
GPT-5.4 Nano
Input
$0.20
2.0× cheaper
Output
$1.25
1.6× cheaper
Mistral Medium 3.1
Input
$0.40
Output
$2.00
GPT-5.4 Nano is cheaper on both: 2.0× input, 1.6× output.
Where to run it
3 hosts
Mistral Medium 3.11 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
66%
Mistral Medium 3.1 uses 72.2x more emoji
GPT-5.4 Nano
Mistral Medium 3.1
51%Vocabulary54%
21wSentence Length21w
0.58Hedging0.43
7.1Bold10.3
5.5Lists5.7
0.01Emoji0.72
1.39Headings1.03
0.05Transitions0.14
Based on 23 + 28 text responses
Research
What we learned reading every model
FAQ
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