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Claude Opus 4.1 vs Mistral Small 3

Claude Opus 4.1 leads Mistral Small 3 on the Artificial Analysis Intelligence Index, 22.8 to 6.7, and Mistral Small 3 costs 937.5x less per output token ($0.08 vs $75.00 per million). Updated October 22, 2026; 27 benchmarks have a result for both.

Replace Claude Opus 4.1 Replace Mistral Small 3
Claude Opus 4.1Anthropic
Coding
No data
Overall
50.2
Output $/M
$75.00
27
Mistral Small 3Mistral AI
Coding
No data
Overall
No data
Output $/M
$0.08
0
vs boards won of 27 shared

Claude Opus 4.1 or Mistral Small 3: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick Claude Opus 4.1 for a larger context window (200K against 33K tokens).

Model AClaude Opus 4.1AnthropicNot benchmarked1 independent benchmarkNo cost per solved taskModel BMistral Small 3Mistral AINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
27
Claude Opus 4.1 only
46
Mistral Small 3 only
9
Like-for-like categories
6 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 4.1 not benchmarked, Mistral Small 3 not benchmarked.
Widest category
Coding, 36.8 points apart on average over 2 shared benchmarks.
Widest single gap
LMArena Text: Japanese: Claude Opus 4.1 1377 against Mistral Small 3 1111, 44.4 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Mistral Small 3 $0.08 per million output tokens, 937.5x apart.
Context window
Claude Opus 4.1 takes 200K tokens, Mistral Small 3 33K.

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 4.1BarsMistral Small 3Ties
Coding20
Intelligence10
Reasoning30
Math20
Knowledge40
General150
All shared boards270
CodingLike-for-likeSix of these boards feed the Vibe Coding Index20
Coding benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
LMArena WebDev1390Not measuredOnly Claude Opus 4.1 measured
LiveCodeBench (Vals AI)66.5%Not measuredOnly Claude Opus 4.1 measured
LiveCodeBench (Artificial Analysis run)Not measured25.2%Only Mistral Small 3 measured
Terminal-Bench38.0%Not measuredOnly Claude Opus 4.1 measured
WeirdML45.9%Not measuredOnly Claude Opus 4.1 measured
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: coding14791246Claude Opus 4.1
LMArena Text: software and IT14561248Claude Opus 4.1
LMArena WebDev: HTML1399Not measuredOnly Claude Opus 4.1 measured
SciCode4.6%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 29 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
AA Intelligence Index22.86.7Claude Opus 4.1
Epoch Capabilities Index144.1Not measuredOnly Claude Opus 4.1 measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index4 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
τ²-Bench TelecomNot measured19.6%Only Mistral Small 3 measured
METR time horizons66.8%Not measuredOnly Claude Opus 4.1 measured
GDPval43.6%Not measuredOnly Claude Opus 4.1 measured
DeepResearch Bench48.3%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
Reasoning benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
GPQA Diamond76.3%Not measuredOnly Claude Opus 4.1 measured
MMMU Pro (Vals AI)77.5%Not measuredOnly Claude Opus 4.1 measured
GPQA Diamond (Artificial Analysis run)Not measured46.2%Only Mistral Small 3 measured
Humanity's Last Exam (Artificial Analysis run)Not measured3.8%Only Mistral Small 3 measured
GPQA Diamond (Epoch AI run)77.3%Not measuredOnly Claude Opus 4.1 measured
SimpleBench60.0%Not measuredOnly Claude Opus 4.1 measured
Mystery game puzzles21.0%Not measuredOnly Claude Opus 4.1 measured
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421233Claude Opus 4.1
LMArena Text: expert14381202Claude Opus 4.1
LMArena Text: hard prompts in English14511243Claude Opus 4.1
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
AIME78.2%Not measuredOnly Claude Opus 4.1 measured
MATH 500 (Vals AI)95.4%Not measuredOnly Claude Opus 4.1 measured
MGSM (Vals AI)94.4%Not measuredOnly Claude Opus 4.1 measured
AA Math IndexNot measured4.3Only Mistral Small 3 measured
AIME 2025 (Artificial Analysis run)Not measured4.3%Only Mistral Small 3 measured
OTIS Mock AIME68.9%Not measuredOnly Claude Opus 4.1 measured
FrontierMath, tiers 1 to 312.6%Not measuredOnly Claude Opus 4.1 measured
FrontierMath, tier 42.4%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: math14311240Claude Opus 4.1
LMArena Text: mathematical work14341243Claude Opus 4.1
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
MMLU Pro87.9%Not measuredOnly Claude Opus 4.1 measured
LegalBench (Vals AI)83.5%Not measuredOnly Claude Opus 4.1 measured
TaxEval (Vals AI)73.7%Not measuredOnly Claude Opus 4.1 measured
MortgageTax (Vals AI)61.1%Not measuredOnly Claude Opus 4.1 measured
MedQA (Vals AI)93.6%Not measuredOnly Claude Opus 4.1 measured
MedCode (Vals AI)47.2%Not measuredOnly Claude Opus 4.1 measured
MMLU Pro (Artificial Analysis run)Not measured65.2%Only Mistral Small 3 measured
LMArena Text: science14221235Claude Opus 4.1
LMArena Text: medicine and healthcare14161215Claude Opus 4.1
LMArena Text: legal and government14211219Claude Opus 4.1
LMArena Text: business and finance14061205Claude Opus 4.1
FACTS Benchmark Suite40.4%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
Design Arena: websites1176Not measuredOnly Claude Opus 4.1 measured
Design Arena: UI components1162Not measuredOnly Claude Opus 4.1 measured
Design Arena: game dev1171Not measuredOnly Claude Opus 4.1 measured
Design Arena: data viz1166Not measuredOnly Claude Opus 4.1 measured
Design Arena: 3D1152Not measuredOnly Claude Opus 4.1 measured
Design Arena: all code categories1170Not measuredOnly Claude Opus 4.1 measured
Design Arena: SVG1152Not measuredOnly Claude Opus 4.1 measured
Design Arena: ASCII art1167Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index150
General benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 3Leader
SAGE (Vals AI)31.4%Not measuredOnly Claude Opus 4.1 measured
MedScribe (Vals AI)73.9%Not measuredOnly Claude Opus 4.1 measured
IFBenchNot measured26.4%Only Mistral Small 3 measured
Long context reasoning (AA-LCR)Not measured0.0%Only Mistral Small 3 measured
DTBench80.0%Not measuredOnly Claude Opus 4.1 measured
LMCA37.1%Not measuredOnly Claude Opus 4.1 measured
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
LMArena Text14191234Claude Opus 4.1
LMArena Text: instruction following14351214Claude Opus 4.1
LMArena Text: creative writing14121194Claude Opus 4.1
LMArena Text: English14331256Claude Opus 4.1
LMArena Text: non-English14051198Claude Opus 4.1
LMArena Text: Chinese14271204Claude Opus 4.1
LMArena Text: German14131211Claude Opus 4.1
LMArena Text: Japanese13771111Claude Opus 4.1
LMArena Text: Korean13811188Claude Opus 4.1
LMArena Text: French14331204Claude Opus 4.1
LMArena Text: Spanish1448Not measuredOnly Claude Opus 4.1 measured
LMArena Text: Russian14221216Claude Opus 4.1
LMArena Text: Polish1413Not measuredOnly Claude Opus 4.1 measured
LMArena Text: multi-turn14441217Claude Opus 4.1
LMArena Text: longer queries14551246Claude Opus 4.1
LMArena Text: writing and language14181214Claude Opus 4.1
LMArena Text: entertainment and media13981184Claude Opus 4.1
Neither model has a result on the other 22 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.1 and Mistral Small 3
BenchmarkClaude Opus 4.1Mistral Small 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 4.1$0.052Fits in one request
Mistral Small 3$0.0001Fits in one request

Mistral Small 3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Mistral Small 3$0.0027Exceeds the context window

Mistral Small 3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds the context window
Mistral Small 3$0.011Exceeds the context window

Mistral Small 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 4.1 and Mistral Small 3
SpecificationAnthropic Claude Opus 4.1Mistral Small 3
MakerAnthropicMistral AI
WeightsNo public weights listedOpen weights
ReleasedAugust 5, 2025January 30, 2025
Context window200K33K
Input $/Mtok$15.00$0.05
Output $/Mtok$75.00$0.08
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it10
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Mistral Small 3 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for a larger context window (200K against 33K tokens).

Which is cheaper, Claude Opus 4.1 or Mistral Small 3?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Mistral Small 3 costs $0.05 and $0.08. Cost per solved task is known for neither of them.

Which has the bigger context window, Claude Opus 4.1 or Mistral Small 3?

Claude Opus 4.1, with 200K tokens against 33K.

How many benchmarks is the Claude Opus 4.1 vs Mistral Small 3 comparison based on?

27 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Mistral Small 3's on 0. Where only one model has a result, the page says so instead of naming a winner.

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