Claude Opus 4 vs Mistral Medium 3

Compare Claude Opus 4 by Anthropic against Mistral Medium 3 by Mistral AI, context windows of 200K vs 131K, tested across 23 shared challenges. Updated April 2026.

Which is better, Claude Opus 4 or Mistral Medium 3?

Claude Opus 4 and Mistral Medium 3 are both competitive models. Claude Opus 4 costs $15/M input tokens vs $0.4/M for Mistral Medium 3. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4 and Mistral Medium 3

Claude Opus 4 is made by anthropic while Mistral Medium 3 is from mistral. Claude Opus 4 has a 200K token context window compared to Mistral Medium 3's 131K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0.4/M for Mistral Medium 3.

Our Verdict
Claude Opus 4
Claude Opus 4
Mistral Medium 3
Mistral Medium 3Runner-up

No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, bigger context window, major provider backing.

Mistral Medium 3 is 38x cheaper per token — worth considering if cost matters.

Slight edge
Writing DNA

Style Comparison

Similarity
97%

Claude Opus 4 uses 3.5x more sentence length

Claude Opus 4
Mistral Medium 3
64%Vocabulary57%
62wSentence Length17w
0.52Hedging0.73
4.4Bold8.6
9.1Lists6.5
0.11Emoji0.06
1.87Headings1.18
0.27Transitions0.15
Based on 16 + 15 text responses
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Claude Opus 4Mistral Medium 3

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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