Mistral Medium 3.1vsOpenAI o3
Mistral Medium 3.1 is cheaper than OpenAI o3 at $0.4/M vs $10/M input tokens.
| Spec | Mistral Medium 3.1 | OpenAI o3 |
|---|---|---|
| Input price | $0.4/M tokens | $10/M tokens |
| Output price | $2/M tokens | $40/M tokens |
| Context window | 131K tokens | — |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Aug 2025 | Apr 2025 |
Our Verdict
OpenAI o3
Mistral Medium 3.1Runner-up
Not enough votes to call it. On the specs, OpenAI o3 has the edge: bigger model tier, major provider backing.
Mistral Medium 3.1 costs 20x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Mistral Medium 3.1
Input
$0.40
25× cheaper
Output
$2.00
20× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Mistral Medium 3.1 is cheaper on both: 25× input, 20× output.
Where to run it
2 hosts
Mistral Medium 3.11 host
OpenAI o31 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
35%
Mistral Medium 3.1 uses 72.2x more emoji
Mistral Medium 3.1
OpenAI o3
54%Vocabulary70%
21wSentence Length14w
0.43Hedging0.27
10.3Bold0.6
5.7Lists2.8
0.72Emoji0.00
1.03Headings0.32
0.14Transitions0.10
Based on 28 + 19 text responses
Research
What we learned reading every model
FAQ
Common questions
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