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Claude Opus 4.5 vs Mistral Medium 3

Claude Opus 4.5 leads Mistral Medium 3 on the Artificial Analysis Intelligence Index, 29.1 to 9.0, and Mistral Medium 3 costs 12.5x less per output token ($2.00 vs $25.00 per million). Updated October 21, 2026; 47 benchmarks have a result for both.

Replace Claude Opus 4.5 Replace Mistral Medium 3
Claude Opus 4.5Anthropic
Coding
44.0
Overall
29.1
Output $/M
$25.00
47
Mistral Medium 3Mistral AI
Coding
No data
Overall
9.0
Output $/M
$2.00
0
vs boards won of 47 shared

Claude Opus 4.5 or Mistral Medium 3: which to pick

Only Claude Opus 4.5 has a coding score, 44.0 on the Vibe Coding Index; Mistral Medium 3 has none, so the two cannot be ranked on coding.

Pick Mistral Medium 3 for output tokens 12.5x cheaper ($2.00 vs $25.00 per million).

Model AClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved taskModel BMistral Medium 3Mistral AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
47
Claude Opus 4.5 only
58
Mistral Medium 3 only
10
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Opus 4.5 44.0 from 3 benchmarks, Mistral Medium 3 not benchmarked.
Widest category
Agentic work, 65.2 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: Claude Opus 4.5 89.5% against Mistral Medium 3 24.3%, 65.2 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.5 $25.00 against Mistral Medium 3 $2.00 per million output tokens, 12.5x apart.
Context window
Claude Opus 4.5 takes 200K tokens, Mistral Medium 3 131K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Opus 4.5BarsMistral Medium 3Ties
Coding40
Intelligence20
Agentic work10
Reasoning50
Math40
Knowledge50
Web design60
General200
All shared boards470
CodingLike-for-likeSix of these boards feed the Vibe Coding Index40
Coding benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
SWE-bench Verified79.2%Not measuredOnly Claude Opus 4.5 measured
SWE-bench (full test set)52.6%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Multilingual70.7%Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev1494Not measuredOnly Claude Opus 4.5 measured
LiveCodeBench (Vals AI)83.7%Not measuredOnly Claude Opus 4.5 measured
SWE-bench Verified (Vals AI)76.4%Not measuredOnly Claude Opus 4.5 measured
Vibe Code Bench (Vals AI)20.6%Not measuredOnly Claude Opus 4.5 measured
LiveCodeBench (Artificial Analysis run)87.1%40.0%Claude Opus 4.5
Terminal-Bench Hard (Artificial Analysis run)47.0%3.8%Claude Opus 4.5
Terminal-Bench63.1%Not measuredOnly Claude Opus 4.5 measured
GSO-Bench26.5%Not measuredOnly Claude Opus 4.5 measured
WeirdML63.7%Not measuredOnly Claude Opus 4.5 measured
Cybench82.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: coding15031385Claude Opus 4.5
LMArena Text: software and IT14831385Claude Opus 4.5
LMArena WebDev: React1478Not measuredOnly Claude Opus 4.5 measured
LMArena WebDev: HTML1510Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
AA Intelligence Index29.19.0Claude Opus 4.5
Epoch Capabilities Index150.1134.0Claude Opus 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
Design Arena: agents building web apps1159Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building full-stack apps1156Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building mobile apps1189Not measuredOnly Claude Opus 4.5 measured
Design Arena: agents building Android apps1175Not measuredOnly Claude Opus 4.5 measured
τ²-Bench Telecom89.5%24.3%Claude Opus 4.5
METR time horizons75.0%Not measuredOnly Claude Opus 4.5 measured
Remote Labor Index3.8%Not measuredOnly Claude Opus 4.5 measured
GDPval45.5%Not measuredOnly Claude Opus 4.5 measured
BALROG43.5%Not measuredOnly Claude Opus 4.5 measured
DeepResearch Bench54.8%Not measuredOnly Claude Opus 4.5 measured
OSWorld66.3%Not measuredOnly Claude Opus 4.5 measured
Vending-Bench 2$4,967Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 27 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index50
Reasoning benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
GPQA Diamond85.9%Not measuredOnly Claude Opus 4.5 measured
MMMU Pro (Vals AI)83.0%Not measuredOnly Claude Opus 4.5 measured
GPQA Diamond (Artificial Analysis run)86.6%57.8%Claude Opus 4.5
Humanity's Last Exam (Artificial Analysis run)30.1%4.1%Claude Opus 4.5
GPQA Diamond (Epoch AI run)86.0%Not measuredOnly Claude Opus 4.5 measured
ARC-AGI80.0%Not measuredOnly Claude Opus 4.5 measured
ARC-AGI-237.6%Not measuredOnly Claude Opus 4.5 measured
SimpleBench62.0%Not measuredOnly Claude Opus 4.5 measured
Chess puzzles14.0%Not measuredOnly Claude Opus 4.5 measured
Mystery game puzzles22.0%Not measuredOnly Claude Opus 4.5 measured
EBR-bench14.3%Not measuredOnly Claude Opus 4.5 measured
VPCT40.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: hard prompts14761364Claude Opus 4.5
LMArena Text: expert14871342Claude Opus 4.5
LMArena Text: hard prompts in English14821374Claude Opus 4.5
LMArena Vision: diagramsNot measured1155Only Mistral Medium 3 measured
LMArena Vision: homeworkNot measured1165Only Mistral Medium 3 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
AIME95.4%Not measuredOnly Claude Opus 4.5 measured
MGSM (Vals AI)95.2%Not measuredOnly Claude Opus 4.5 measured
AA Math Index91.330.3Claude Opus 4.5
AIME 2025 (Artificial Analysis run)91.3%30.3%Claude Opus 4.5
OTIS Mock AIME86.1%Not measuredOnly Claude Opus 4.5 measured
FrontierMath, tiers 1 to 334.4%Not measuredOnly Claude Opus 4.5 measured
FrontierMath, tier 44.9%Not measuredOnly Claude Opus 4.5 measured
ProofBench36.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: math14631353Claude Opus 4.5
LMArena Text: mathematical work14681354Claude Opus 4.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index50
Knowledge benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
MMLU Pro87.3%Not measuredOnly Claude Opus 4.5 measured
LegalBench (Vals AI)84.6%Not measuredOnly Claude Opus 4.5 measured
CaseLaw (Vals AI)62.6%Not measuredOnly Claude Opus 4.5 measured
CorpFin (Vals AI)65.1%Not measuredOnly Claude Opus 4.5 measured
TaxEval (Vals AI)74.9%Not measuredOnly Claude Opus 4.5 measured
MortgageTax (Vals AI)68.7%Not measuredOnly Claude Opus 4.5 measured
MedQA (Vals AI)95.9%Not measuredOnly Claude Opus 4.5 measured
MedCode (Vals AI)49.2%Not measuredOnly Claude Opus 4.5 measured
MMLU Pro (Artificial Analysis run)89.5%76.0%Claude Opus 4.5
SimpleQA Verified45.7%Not measuredOnly Claude Opus 4.5 measured
GeoBench75.0%Not measuredOnly Claude Opus 4.5 measured
LMArena Text: science14541381Claude Opus 4.5
LMArena Text: medicine and healthcare14441381Claude Opus 4.5
LMArena Text: legal and government14591384Claude Opus 4.5
LMArena Text: business and finance14481352Claude Opus 4.5
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
Design Arena: websites12471079Claude Opus 4.5
Design Arena: UI components12381024Claude Opus 4.5
Design Arena: game dev12291018Claude Opus 4.5
Design Arena: data viz12431034Claude Opus 4.5
Design Arena: 3D12141084Claude Opus 4.5
Design Arena: all code categories12421069Claude Opus 4.5
Design Arena: SVG1181Not measuredOnly Claude Opus 4.5 measured
Design Arena: ASCII art1190Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index200
General benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
SAGE (Vals AI)52.1%Not measuredOnly Claude Opus 4.5 measured
MedScribe (Vals AI)85.3%Not measuredOnly Claude Opus 4.5 measured
IFBench58.0%39.3%Claude Opus 4.5
Long context reasoning (AA-LCR)77.3%31.3%Claude Opus 4.5
DTBench89.9%62.3%Claude Opus 4.5
LMCA44.5%Not measuredOnly Claude Opus 4.5 measured
CL-bench21.1%Not measuredOnly Claude Opus 4.5 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.5 measured
LMArena Text14511370Claude Opus 4.5
LMArena Text: instruction following14781338Claude Opus 4.5
LMArena Text: creative writing14451343Claude Opus 4.5
LMArena VisionNot measured1157Only Mistral Medium 3 measured
LMArena Text: English14611385Claude Opus 4.5
LMArena Text: non-English14381353Claude Opus 4.5
LMArena Text: Chinese14701374Claude Opus 4.5
LMArena Text: German14491377Claude Opus 4.5
LMArena Text: Japanese14171316Claude Opus 4.5
LMArena Text: Korean14241304Claude Opus 4.5
LMArena Text: French14711368Claude Opus 4.5
LMArena Text: Spanish14571364Claude Opus 4.5
LMArena Text: Russian14471359Claude Opus 4.5
LMArena Text: Polish14391371Claude Opus 4.5
LMArena Text: multi-turn14661384Claude Opus 4.5
LMArena Text: longer queries14791360Claude Opus 4.5
LMArena Text: writing and language14521352Claude Opus 4.5
LMArena Text: entertainment and media14341335Claude Opus 4.5
LMArena Vision: EnglishNot measured1172Only Mistral Medium 3 measured
LMArena Vision: ChineseNot measured1161Only Mistral Medium 3 measured
LMArena Vision: reading textNot measured1154Only Mistral Medium 3 measured
LMArena Vision: humorNot measured1145Only Mistral Medium 3 measured
LMArena Vision: captioningNot measured1094Only Mistral Medium 3 measured
LMArena Vision: recognizing thingsNot measured1141Only Mistral Medium 3 measured
LMArena Vision: creative writingNot measured1146Only Mistral Medium 3 measured
LMArena Document1462Not measuredOnly Claude Opus 4.5 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.5 and Mistral Medium 3
BenchmarkClaude Opus 4.5Mistral Medium 3Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Opus 4.5$0.018Fits in one request
Mistral Medium 3$0.0014Fits in one request

Mistral Medium 3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.5$0.325Fits in one request
Mistral Medium 3$0.026Fits in one request

Mistral Medium 3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.5$1.25Exceeds the context window
Mistral Medium 3$0.100Exceeds the context window

Mistral Medium 3 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Opus 4.5 and Mistral Medium 3
SpecificationAnthropic Claude Opus 4.5Mistral Medium 3
MakerAnthropicMistral AI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 24, 2025May 7, 2025
Context window200K131K
Input $/Mtok$5.00$0.40
Output $/Mtok$25.00$2.00
Coding index44.0Not benchmarked
Independent measurements behind it30
Cost per solved task$1.37Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.5 better than Mistral Medium 3 for coding?

Only Claude Opus 4.5 has a coding score, 44.0 on the Vibe Coding Index; Mistral Medium 3 has none, so the two cannot be ranked on coding. Pick Mistral Medium 3 for output tokens 12.5x cheaper ($2.00 vs $25.00 per million).

Which is cheaper, Claude Opus 4.5 or Mistral Medium 3?

Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Mistral Medium 3 costs $0.40 and $2.00. Cost per solved task is known for Claude Opus 4.5 only.

Which has the bigger context window, Claude Opus 4.5 or Mistral Medium 3?

Claude Opus 4.5, with 200K tokens against 131K.

How many benchmarks is the Claude Opus 4.5 vs Mistral Medium 3 comparison based on?

47 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.5's coding index rests on 3 independent benchmarks and Mistral Medium 3's on 0. Where only one model has a result, the page says so instead of naming a winner.

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