Claude Opus 4.5
VS
Mistral Medium 3.1
Claude Opus 4.5 vs Mistral Medium 3.1: which wins at real work?
22 task areas · same graded test runs · rank comparison only, so 0–100 and Elo collections never mix raw scores.
Claude Opus 4.5 wins 21 of 22 task areas we tested; Mistral Medium 3.1 takes 1. Mistral Medium 3.1 costs 12.5× less per token ($2.4 vs $30 per 1M).
Mistral Medium 3.1 costs 12.5× less per token ($2.4 vs $30 per 1M).
Task by task
| Task area | Claude Opus 4.5 | Mistral Medium 3.1 | Winner |
|---|---|---|---|
| AI Strategy |
#16
/ 126
Strong
|
#120
/ 126
Usable
|
Claude Opus 4.5 |
| Chef / Home Cooking |
#14
/ 126
Strong
|
#116
/ 126
Needs editing
|
Claude Opus 4.5 |
| Creative & Comedy | #8 / 110 | #100 / 110 | Claude Opus 4.5 |
| Executive Assistant |
#4
/ 112
Strong
|
#94
/ 112
Usable
|
Claude Opus 4.5 |
| Content & Brand |
#21
/ 124
Strong
|
#110
/ 124
Needs editing
|
Claude Opus 4.5 |
| Sales |
#3
/ 110
Strong
|
#92
/ 110
Usable
|
Claude Opus 4.5 |
| Research & Competitive Analysis |
#17
/ 110
Excellent
|
#105
/ 110
Weak
|
Claude Opus 4.5 |
| Data & Analytics |
#9
/ 110
Excellent
|
#87
/ 110
Excellent
|
Claude Opus 4.5 |
| Coding |
#39
/ 115
Strong
|
#108
/ 115
Needs editing
|
Claude Opus 4.5 |
| Presentations & Decks |
#45
/ 110
Excellent
|
#105
/ 110
Usable
|
Claude Opus 4.5 |
| RAG, Safety & Grounding |
#52
/ 113
Excellent
|
#111
/ 113
Strong
|
Claude Opus 4.5 |
| Landing Pages |
#7
/ 72
Strong
|
#63
/ 72
Usable
|
Claude Opus 4.5 |
| Investor & Pitch |
#10
/ 66
Strong
|
#65
/ 66
Needs editing
|
Claude Opus 4.5 |
| Customer Support |
#56
/ 113
Strong
|
#110
/ 113
Needs editing
|
Claude Opus 4.5 |
| Translation & Localization |
#5
/ 110
Excellent
|
#53
/ 110
Excellent
|
Claude Opus 4.5 |
| Legal & HR |
#30
/ 110
Excellent
|
#70
/ 110
Strong
|
Claude Opus 4.5 |
| Summarization & Meeting Notes |
#1
/ 110
Excellent
|
#39
/ 110
Excellent
|
Claude Opus 4.5 |
| Frontend & Landing Pages |
#2
/ 109
Usable
|
#35
/ 109
Needs editing
|
Claude Opus 4.5 |
| Knowledge & Docs |
#47
/ 110
Strong
|
#77
/ 110
Usable
|
Claude Opus 4.5 |
| Training & Education |
#24
/ 110
Excellent
|
#47
/ 110
Excellent
|
Claude Opus 4.5 |
| Product & Project Management |
#60
/ 110
Strong
|
#50
/ 110
Strong
|
Mistral Medium 3.1 |
| Structured Output |
#82
/ 113
Strong
|
#91
/ 113
Strong
|
Claude Opus 4.5 |
Rank = position among every model config we tested in that task area (lower is better). Sorted by biggest gap first.
Same task, both models — judged
Both models answered the same test case; an independent judge graded each. Quotes are the judge's actual rationale.
Sales
Enterprise CFO, duplicate invoices (Cold Outbound Email)
“The response is an expert-level cold email that perfectly balances the strict word count constraint with the required facts and context. It leads with a highly relevant problem, avoids all negative constraints, and uses a modern, low-friction soft CTA. It is highly skimmable and production-ready.”
“The email is well-structured, brief, and effectively leads with the prospect's specific trigger and problem. However, it violates a negative constraint by claiming the tool catches errors 'without adding manual reviews', which misrepresents the product's workflow. The CTA is also slightly high-friction for a first-touch cold email.”
Frequently asked
Is Claude Opus 4.5 better than Mistral Medium 3.1?
Across 22 task areas we benchmarked, Claude Opus 4.5 ranks higher in 21 and Mistral Medium 3.1 in 1.
Which is cheaper, Claude Opus 4.5 or Mistral Medium 3.1?
Mistral Medium 3.1 costs 12.5× less per token ($2.4 vs $30 per 1M).
What is Claude Opus 4.5 better at?
Claude Opus 4.5 out-ranks Mistral Medium 3.1 at AI Strategy, Chef / Home Cooking, Creative & Comedy.
What is Mistral Medium 3.1 better at?
Mistral Medium 3.1 out-ranks Claude Opus 4.5 at Product & Project Management.
More comparisons
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Prompt × model results
12 test cases · 3 evals