What is the difference between Claude Opus 4.5 and Mistral Medium 3.1?

Claude Opus 4.5 is developed by Anthropic while Mistral Medium 3.1 is developed by Mistral AI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or Mistral Medium 3.1?

It depends on your use case. Claude Opus 4.5 and Mistral Medium 3.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.5 and Mistral Medium 3.1 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and Mistral Medium 3.1 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between Claude Opus 4.5 and Mistral Medium 3.1?

Claude Opus 4.5 is developed by Anthropic while Mistral Medium 3.1 is developed by Mistral AI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or Mistral Medium 3.1?

It depends on your use case. Claude Opus 4.5 and Mistral Medium 3.1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.5 and Mistral Medium 3.1 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and Mistral Medium 3.1 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Claude Opus 4.5 vs Mistral Medium 3.1: Which Is Better?

Updated Nov 2025

Our Verdict

Claude Opus 4.5

Mistral Medium 3.1Runner-up

No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

Mistral Medium 3.1

Input

$0.40

Output

$2.00

Writing DNA

Style Comparison

Similarity

58%

Mistral Medium 3.1 uses 3.5x more transitions

Claude Opus 4.5

Mistral Medium 3.1

64%Vocabulary52%

55wSentence Length22w

0.86Hedging0.45

5.8Bold10.4

4.5Lists5.9

0.15Emoji0.39

1.59Headings1.12

0.05Transitions0.18

Based on 24 + 22 text responses

Research

What we learned reading every model

Claude Opus 4.5 and Mistral Medium 3.1 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

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Claude Opus 4.5 vs Grok 3New provider

Claude Opus 4.5 vs OpenAI o3New provider

Updated Nov 2025

Our Verdict

Claude Opus 4.5

Mistral Medium 3.1Runner-up

No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer, major provider backing.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

Mistral Medium 3.1

Input

$0.40

Output

$2.00

Writing DNA

Style Comparison

Similarity

58%

Mistral Medium 3.1 uses 3.5x more transitions

Claude Opus 4.5

Mistral Medium 3.1

64%Vocabulary52%

55wSentence Length22w

0.86Hedging0.45

5.8Bold10.4

4.5Lists5.9

0.15Emoji0.39

1.59Headings1.12

0.05Transitions0.18

Based on 24 + 22 text responses

Research

What we learned reading every model

Claude Opus 4.5 and Mistral Medium 3.1 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Mistral Medium 3.1 vs MiniMax M3New provider

Claude Opus 4.5 vs Grok 3New provider

Claude Opus 4.5 vs OpenAI o3New provider