Mistral Small 4 vs OpenAI o3
Compare Mistral Small 4 by Mistral AI against OpenAI o3 by OpenAI, tested across 53 shared challenges. Updated May 2026.
Which is better, Mistral Small 4 or OpenAI o3?
Mistral Small 4 and OpenAI o3 are both competitive models. Mistral Small 4 costs $0.15/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.
Key Differences Between Mistral Small 4 and OpenAI o3
Mistral Small 4 is made by mistral while OpenAI o3 is from openai. On pricing, Mistral Small 4 costs $0.15/M input tokens vs $10/M for OpenAI o3.
API pricing
Per 1M tokens
Mistral Small 4
Input
$0.15
67× cheaper
Output
$0.60
67× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Mistral Small 4 is cheaper on both — 67× input, 67× output
Our Verdict
OpenAI o3
Mistral Small 4Runner-up
No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier, major provider backing.
Mistral Small 4 is 67x cheaper per token — worth considering if cost matters.
Too close to call
Writing DNA
Style Comparison
Similarity
35%
Mistral Small 4 uses 19.0x more emoji
Mistral Small 4
OpenAI o3
50%Vocabulary68%
18wSentence Length14w
0.58Hedging0.26
9.0Bold0.7
5.6Lists3.0
0.19Emoji0.00
1.10Headings0.38
0.12Transitions0.12
Based on 23 + 16 text responses
FAQ
