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Mistral Medium 3.1 vs OpenAI o4-mini

Compare Mistral Medium 3.1 by Mistral AI against OpenAI o4-mini by OpenAI, tested across 35 shared challenges. Updated April 2026.

Which is better, Mistral Medium 3.1 or OpenAI o4-mini?

Mistral Medium 3.1 and OpenAI o4-mini are both competitive models. Mistral Medium 3.1 costs $0.4/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.

Key Differences Between Mistral Medium 3.1 and OpenAI o4-mini

Mistral Medium 3.1 is made by mistral while OpenAI o4-mini is from openai. On pricing, Mistral Medium 3.1 costs $0.4/M input tokens vs $1.1/M for OpenAI o4-mini.

Our Verdict
Mistral Medium 3.1
Mistral Medium 3.1
OpenAI o4-mini
OpenAI o4-miniRunner-up

No community votes yet. On paper, Mistral Medium 3.1 has the edge — bigger model tier, newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
93%

Mistral Medium 3.1 uses 1042.8x more bold

Mistral Medium 3.1
OpenAI o4-mini
52%Vocabulary73%
22wSentence Length15w
0.45Hedging0.18
10.4Bold0.0
5.9Lists2.1
0.39Emoji0.00
1.12Headings0.00
0.18Transitions0.02
Based on 22 + 10 text responses
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Mistral Medium 3.1OpenAI o4-mini

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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