Mistral Medium 3 vs Claude Opus 4

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

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

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

Key Differences Between Mistral Medium 3 and Claude Opus 4

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

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

Mistral Medium 3
Claude Opus 4
57%Vocabulary64%
17wSentence Length62w
0.73Hedging0.52
8.6Bold4.4
6.5Lists9.1
0.06Emoji0.11
1.18Headings1.87
0.15Transitions0.27
Based on 15 + 16 text responses
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Mistral Medium 3Claude Opus 4

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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