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Mistral Small 3 vs o3 Mini

o3 Mini leads Mistral Small 3 on the Artificial Analysis Intelligence Index, 12.5 to 6.7, and Mistral Small 3 costs 55.0x less per output token ($0.08 vs $4.40 per million). Updated October 21, 2026; 34 benchmarks have a result for both.

Replace Mistral Small 3 Replace o3 Mini
Mistral Small 3Mistral AI
Coding
No data
Overall
No data
Output $/M
$0.08
0
o3 MiniOpenAI
Coding
No data
Overall
38.0
Output $/M
$4.40
34
vs boards won of 34 shared

Mistral Small 3 or o3 Mini: which to pick

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

Pick Mistral Small 3 for output tokens 55.0x cheaper ($0.08 vs $4.40 per million) and work measured by LiveCodeBench (Artificial Analysis run) or LMArena Text: coding, where it leads.

Model AMistral Small 3Mistral AINot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo3 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
34
Mistral Small 3 only
2
o3 Mini only
37
Like-for-like categories
7 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
Mistral Small 3 not benchmarked, o3 Mini not benchmarked.
Widest category
Coding, 29.8 points apart on average over 3 shared benchmarks.
Widest single gap
LiveCodeBench (Artificial Analysis run): Mistral Small 3 25.2% against o3 Mini 73.4%, 48.2 points apart on a 0 to 100 scale.
Output price
Mistral Small 3 $0.08 against o3 Mini $4.40 per million output tokens, 55.0x apart.
Context window
Mistral Small 3 takes 33K tokens, o3 Mini 200K.

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
CategoryMistral Small 3Barso3 MiniTies
Coding03
Intelligence01
Agentic work01
Reasoning05
Math02
Knowledge05
General017
All shared boards034
CodingLike-for-likeSix of these boards feed the Vibe Coding Index03
Coding benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
Aider polyglotNot measured60.4%Only o3 Mini measured
SWE-bench VerifiedNot measured42.4%Only o3 Mini measured
SWE-bench LiteNot measured32.3%Only o3 Mini measured
LiveCodeBench (Vals AI)Not measured71.5%Only o3 Mini measured
LiveCodeBench (Artificial Analysis run)25.2%73.4%o3 Mini
SciCodeNot measured42.8%Only o3 Mini measured
Terminal-Bench Hard (Artificial Analysis run)Not measured6.8%Only o3 Mini measured
GSO-BenchNot measured1.3%Only o3 Mini measured
WeirdMLNot measured43.7%Only o3 Mini measured
CybenchNot measured22.5%Only o3 Mini measured
LMArena Text: coding12461378o3 Mini
LMArena Text: software and IT12481364o3 Mini
SciCodeNot measured7.7%Only o3 Mini measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
AA Intelligence Index6.712.5o3 Mini
Epoch Capabilities IndexNot measured140.2Only o3 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
τ²-Bench Telecom19.6%31.3%o3 Mini
Neither model has a result on the other 40 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index05
Reasoning benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
GPQA DiamondNot measured75.5%Only o3 Mini measured
GPQA Diamond (Artificial Analysis run)46.2%77.3%o3 Mini
Humanity's Last Exam (Artificial Analysis run)3.8%12.0%o3 Mini
GPQA Diamond (Epoch AI run)Not measured77.0%Only o3 Mini measured
ARC-AGINot measured34.5%Only o3 Mini measured
ARC-AGI-2Not measured3.0%Only o3 Mini measured
SimpleBenchNot measured22.8%Only o3 Mini measured
Chess puzzlesNot measured15.0%Only o3 Mini measured
Mystery game puzzlesNot measured7.0%Only o3 Mini measured
LMArena Text: hard prompts12331365o3 Mini
LMArena Text: expert12021364o3 Mini
LMArena Text: hard prompts in English12431375o3 Mini
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
AIMENot measured86.5%Only o3 Mini measured
MATH 500 (Vals AI)Not measured91.8%Only o3 Mini measured
MGSM (Vals AI)Not measured91.3%Only o3 Mini measured
AA Math Index4.3Not measuredOnly Mistral Small 3 measured
AIME 2025 (Artificial Analysis run)4.3%Not measuredOnly Mistral Small 3 measured
OTIS Mock AIMENot measured76.9%Only o3 Mini measured
FrontierMath, tiers 1 to 3Not measured18.6%Only o3 Mini measured
FrontierMath, tier 4Not measured0.0%Only o3 Mini measured
MATH level 5Not measured96.5%Only o3 Mini measured
LMArena Text: math12401396o3 Mini
LMArena Text: mathematical work12431399o3 Mini
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index05
Knowledge benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
MMLU ProNot measured78.7%Only o3 Mini measured
LegalBench (Vals AI)Not measured71.5%Only o3 Mini measured
CorpFin (Vals AI)Not measured45.3%Only o3 Mini measured
TaxEval (Vals AI)Not measured69.4%Only o3 Mini measured
MedQA (Vals AI)Not measured94.8%Only o3 Mini measured
MMLU Pro (Artificial Analysis run)65.2%80.2%o3 Mini
SimpleQA VerifiedNot measured15.3%Only o3 Mini measured
LMArena Text: science12351339o3 Mini
LMArena Text: medicine and healthcare12151330o3 Mini
LMArena Text: legal and government12191328o3 Mini
LMArena Text: business and finance12051313o3 Mini
Neither model has a result on the other 7 boards here
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Web design benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
Neither model has a result on 9 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index017
General benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
IFBench26.4%67.1%o3 Mini
Long context reasoning (AA-LCR)0.0%43.0%o3 Mini
DTBenchNot measured68.8%Only o3 Mini measured
LMCANot measured19.0%Only o3 Mini measured
Fiction.LiveBenchNot measured50.0%Only o3 Mini measured
Creative writing (Lech Mazur)Not measured61.7%Only o3 Mini measured
LMArena Text12341337o3 Mini
LMArena Text: instruction following12141337o3 Mini
LMArena Text: creative writing11941286o3 Mini
LMArena Text: English12561351o3 Mini
LMArena Text: non-English11981319o3 Mini
LMArena Text: Chinese12041379o3 Mini
LMArena Text: German12111303o3 Mini
LMArena Text: Japanese11111286o3 Mini
LMArena Text: Korean11881313o3 Mini
LMArena Text: French12041334o3 Mini
LMArena Text: SpanishNot measured1321Only o3 Mini measured
LMArena Text: Russian12161304o3 Mini
LMArena Text: PolishNot measured1294Only o3 Mini measured
LMArena Text: multi-turn12171320o3 Mini
LMArena Text: longer queries12461343o3 Mini
LMArena Text: writing and language12141313o3 Mini
LMArena Text: entertainment and media11841283o3 Mini
Neither model has a result on the other 23 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Mistral Small 3 and o3 Mini
BenchmarkMistral Small 3o3 MiniLeader
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

Mistral Small 3$0.0001Fits in one request
o3 Mini$0.0033Fits in one request

Mistral Small 3 costs less

Repository review

50K input + 3K output tokens

Mistral Small 3$0.0027Exceeds the context window
o3 Mini$0.068Fits in one request

Mistral Small 3 costs less

Agent loop

200K input + 10K output tokens

Mistral Small 3$0.011Exceeds the context window
o3 Mini$0.264Exceeds 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 Mistral Small 3 and o3 Mini
SpecificationMistral Small 3OpenAI o3 Mini
MakerMistral AIOpenAI
WeightsOpen weightsNo public weights listed
ReleasedJanuary 30, 2025January 31, 2025
Context window33K200K
Input $/Mtok$0.05$1.10
Output $/Mtok$0.08$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Mistral Small 3 better than o3 Mini for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Mistral Small 3 for output tokens 55.0x cheaper ($0.08 vs $4.40 per million) and work measured by LiveCodeBench (Artificial Analysis run) or LMArena Text: coding, where it leads.

Which is cheaper, Mistral Small 3 or o3 Mini?

Mistral Small 3 costs $0.05 per million input tokens and $0.08 per million output tokens; o3 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, Mistral Small 3 or o3 Mini?

o3 Mini, with 200K tokens against 33K.

How many benchmarks is the Mistral Small 3 vs o3 Mini comparison based on?

34 benchmarks have a result for both models as of October 21, 2026. Mistral Small 3's coding index rests on 0 independent benchmarks and o3 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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