GPT-5.5 vs Mistral Small 4
Compare GPT-5.5 by OpenAI against Mistral Small 4 by Mistral AI, context windows of 1.1M vs 262K, tested across 53 shared challenges.
Our Verdict
GPT-5.5
Mistral Small 4Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier, newer, bigger context window, major provider backing.
Mistral Small 4 is 50x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.5
Input
$5.00
Output
$30.00
Mistral Small 4
Input
$0.15
33× cheaper
Output
$0.60
50× cheaper
Mistral Small 4 is cheaper on both — 33× input, 50× output
Writing DNA
Style Comparison
Similarity
45%
Mistral Small 4 uses 19.0x more emoji
GPT-5.5
Mistral Small 4
58%Vocabulary50%
18wSentence Length18w
0.74Hedging0.58
2.9Bold9.0
5.1Lists5.6
0.00Emoji0.19
1.68Headings1.10
0.03Transitions0.12
Based on 26 + 23 text responses
Research
What we learned reading every model
FAQ
