Claude Opus 4.5vsMistral Medium 3
Claude Opus 4.5 is the newer model, released after Mistral Medium 3.
| Spec | Claude Opus 4.5 | Mistral Medium 3 |
|---|---|---|
| Input price | — | $0.4/M tokens |
| Output price | — | $2/M tokens |
| Context window | — | 131K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | May 2025 |
Our Verdict
Claude Opus 4.5
Mistral Medium 3Runner-up
Not enough votes to call it. On the specs, Claude Opus 4.5 has the edge: bigger model tier, newer, major provider backing.
Claude Opus 4.5 takes Reasoning.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
Mistral Medium 3
Input
$0.40
Output
$2.00
Where to run it
5 hosts
Mistral Medium 31 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
60%
Mistral Medium 3 uses 3.5x more transitions
Claude Opus 4.5
Mistral Medium 3
66%Vocabulary55%
51wSentence Length18w
0.82Hedging0.75
6.0Bold7.0
4.5Lists5.2
0.18Emoji0.23
1.46Headings1.11
0.05Transitions0.16
Based on 27 + 28 text responses
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