Mistral Medium 3 vs OpenAI o4-mini

Compare Mistral Medium 3 by Mistral AI against OpenAI o4-mini by OpenAI, tested across 27 shared challenges. Updated April 2026.

Which is better, Mistral Medium 3 or OpenAI o4-mini?

Mistral Medium 3 and OpenAI o4-mini are both competitive models. Mistral Medium 3 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 and OpenAI o4-mini

Mistral Medium 3 is made by mistral while OpenAI o4-mini is from openai. On pricing, Mistral Medium 3 costs $0.4/M input tokens vs $1.1/M for OpenAI o4-mini.

Our Verdict
Mistral Medium 3
Mistral Medium 3
OpenAI o4-mini
OpenAI o4-mini

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call
Writing DNA

Style Comparison

Similarity
93%

Mistral Medium 3 uses 859.1x more bold

Mistral Medium 3
OpenAI o4-mini
57%Vocabulary73%
17wSentence Length15w
0.73Hedging0.18
8.6Bold0.0
6.5Lists2.1
0.06Emoji0.00
1.18Headings0.00
0.15Transitions0.02
Based on 15 + 10 text responses
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Mistral Medium 3OpenAI 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
Free preview13 of 58 slides
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