Claude 3 Opus vs Mistral Medium 3

Compare Claude 3 Opus by Anthropic against Mistral Medium 3 by Mistral AI, context windows of 200K vs 131K, tested across 9 shared challenges. Updated April 2026.

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

Claude 3 Opus and Mistral Medium 3 are both competitive models. Claude 3 Opus 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 3 Opus and Mistral Medium 3

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

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

No community votes yet. On paper, Claude 3 Opus 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.

Too close to call
Writing DNA

Style Comparison

Similarity
94%

Mistral Medium 3 uses 859.1x more bold

Claude 3 Opus
Mistral Medium 3
54%Vocabulary57%
14wSentence Length17w
0.48Hedging0.73
0.0Bold8.6
3.0Lists6.5
0.00Emoji0.06
0.00Headings1.18
0.06Transitions0.15
Based on 3 + 15 text responses
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Claude 3 OpusMistral 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
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