Claude Opus 5 vs Mistral Small 4
Compare Claude Opus 5 by Anthropic against Mistral Small 4 by Mistral AI, context windows of 1.0M vs 262K, tested across 53 shared challenges.
Our Verdict
Claude Opus 5
Mistral Small 4Runner-up
No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window, major provider backing.
Mistral Small 4 is 42x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
Output
$25.00
Mistral Small 4
Input
$0.15
33× cheaper
Output
$0.60
42× cheaper
Mistral Small 4 is cheaper on both — 33× input, 42× output
Writing DNA
Style Comparison
Similarity
41%
Mistral Small 4 uses 11.1x more emoji
Claude Opus 5
Mistral Small 4
54%Vocabulary50%
21wSentence Length18w
0.40Hedging0.58
3.9Bold9.0
1.9Lists5.6
0.02Emoji0.19
0.71Headings1.10
0.05Transitions0.12
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
