Claude Opus 4.5vsMistral Devstral Medium
Claude Opus 4.5 is the newer model, released after Mistral Devstral Medium.
| Spec | Claude Opus 4.5 | Mistral Devstral Medium |
|---|---|---|
| Input price | — | $0.4/M tokens |
| Output price | — | $2/M tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Jul 2025 |
| SWE-bench Verified | 80.9% | 61.6% |
Our Verdict
Claude Opus 4.5
Mistral Devstral MediumRunner-up
Not enough votes to call it. On the specs, Claude Opus 4.5 has the edge: bigger model tier, newer, major provider backing.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
Mistral Devstral Medium
Input
$0.40
Output
$2.00
Where to run it
4 hosts
Mistral Devstral Medium
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
27%
Claude Opus 4.5 uses 18.5x more emoji
Claude Opus 4.5
Mistral Devstral Medium
66%Vocabulary50%
51wSentence Length18w
0.82Hedging0.50
6.0Bold4.1
4.5Lists4.8
0.18Emoji0.00
1.46Headings0.19
0.05Transitions0.29
Based on 27 + 27 text responses
Research
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