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Mistral Small 3.1 24B vs Step 3.5 Flash

Step 3.5 Flash costs 1.9x less per output token than Mistral Small 3.1 24B ($0.30 vs $0.555 per million). Updated October 21, 2026; 28 benchmarks have a result for both.

Replace Mistral Small 3.1 24B Replace Step 3.5 Flash
Mistral Small 3.1 24BMistral AI
Coding
No data
Overall
No data
Output $/M
$0.555
0
Step 3.5 FlashStepFun
Coding
No data
Overall
No data
Output $/M
$0.30
28
vs boards won of 28 shared

Mistral Small 3.1 24B or Step 3.5 Flash: which to pick

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

Pick Mistral Small 3.1 24B for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AMistral Small 3.1 24BMistral AINot benchmarkedNo coding benchmarkNo cost per solved taskModel BStep 3.5 FlashStepFunNot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
28
Mistral Small 3.1 24B only
10
Step 3.5 Flash only
7
Like-for-like categories
5 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 3.1 24B not benchmarked, Step 3.5 Flash not benchmarked.
Widest category
Math, 24.7 points apart on average over 2 shared benchmarks.
Widest single gap
LMArena Text: Chinese: Mistral Small 3.1 24B 1253 against Step 3.5 Flash 1446, 32.3 points apart on a 0 to 100 scale.
Output price
Mistral Small 3.1 24B $0.555 against Step 3.5 Flash $0.30 per million output tokens, 1.9x apart.
Context window
Mistral Small 3.1 24B takes 128K tokens, Step 3.5 Flash 262K.

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 3.1 24BBarsStep 3.5 FlashTies
Coding02
Reasoning03
Math02
Knowledge04
General017
All shared boards028
CodingLike-for-likeSix of these boards feed the Vibe Coding Index02
Coding benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
Terminal-Bench Hard (Artificial Analysis run)Not measured32.6%Only Step 3.5 Flash measured
LMArena Text: coding13091436Step 3.5 Flash
LMArena Text: software and IT13011434Step 3.5 Flash
Neither model has a result on the other 36 boards here
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
Intelligence benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
AA Intelligence IndexNot measured17.0Only Step 3.5 Flash measured
Neither model has a result on the other 1 board here
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
Agentic work benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
τ²-Bench TelecomNot measured94.4%Only Step 3.5 Flash measured
Neither model has a result on the other 40 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index03
Reasoning benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
GPQA Diamond (Artificial Analysis run)Not measured83.1%Only Step 3.5 Flash measured
Humanity's Last Exam (Artificial Analysis run)Not measured24.5%Only Step 3.5 Flash measured
LMArena Text: hard prompts12781411Step 3.5 Flash
LMArena Text: expert12571421Step 3.5 Flash
LMArena Text: hard prompts in English12901421Step 3.5 Flash
LMArena Vision: diagrams1119Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: homework1158Not measuredOnly Mistral Small 3.1 24B measured
Neither model has a result on the other 15 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
LMArena Text: math12611408Step 3.5 Flash
LMArena Text: mathematical work12711421Step 3.5 Flash
Neither model has a result on the other 11 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
LMArena Text: science12651415Step 3.5 Flash
LMArena Text: medicine and healthcare12671408Step 3.5 Flash
LMArena Text: legal and government12711408Step 3.5 Flash
LMArena Text: business and finance12571394Step 3.5 Flash
Neither model has a result on the other 14 boards here
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Web design benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
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 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
IFBenchNot measured66.5%Only Step 3.5 Flash measured
Long context reasoning (AA-LCR)Not measured63.0%Only Step 3.5 Flash measured
LMArena Text12771403Step 3.5 Flash
LMArena Text: instruction following12631385Step 3.5 Flash
LMArena Text: creative writing12521357Step 3.5 Flash
LMArena Vision1136Not measuredOnly Mistral Small 3.1 24B measured
LMArena Text: English12951417Step 3.5 Flash
LMArena Text: non-English12551385Step 3.5 Flash
LMArena Text: Chinese12531446Step 3.5 Flash
LMArena Text: German12661405Step 3.5 Flash
LMArena Text: Japanese12081353Step 3.5 Flash
LMArena Text: Korean12071351Step 3.5 Flash
LMArena Text: French12731421Step 3.5 Flash
LMArena Text: Spanish12841419Step 3.5 Flash
LMArena Text: Russian12631385Step 3.5 Flash
LMArena Text: Polish12421389Step 3.5 Flash
LMArena Text: multi-turn12701404Step 3.5 Flash
LMArena Text: longer queries12991402Step 3.5 Flash
LMArena Text: writing and language12681372Step 3.5 Flash
LMArena Text: entertainment and media12501360Step 3.5 Flash
LMArena Vision: English1157Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: Chinese1155Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: reading text1132Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: humor1142Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: captioning1153Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: recognizing things1155Not measuredOnly Mistral Small 3.1 24B measured
LMArena Vision: creative writing1123Not measuredOnly Mistral Small 3.1 24B measured
Neither model has a result on the other 19 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Mistral Small 3.1 24B and Step 3.5 Flash
BenchmarkMistral Small 3.1 24BStep 3.5 FlashLeader
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 3.1 24B$0.0006Fits in one request
Step 3.5 Flash$0.0003Fits in one request

Step 3.5 Flash costs less

Repository review

50K input + 3K output tokens

Mistral Small 3.1 24B$0.019Fits in one request
Step 3.5 Flash$0.0059Fits in one request

Step 3.5 Flash costs less

Agent loop

200K input + 10K output tokens

Mistral Small 3.1 24B$0.076Exceeds the context window
Step 3.5 Flash$0.023Fits in one request

Step 3.5 Flash 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 3.1 24B and Step 3.5 Flash
SpecificationMistral Small 3.1 24BStepFun Step 3.5 Flash
MakerMistral AIStepFun
WeightsOpen weightsOpen weights
ReleasedMarch 17, 2025January 29, 2026
Context window128K262K
Input $/Mtok$0.351$0.10
Output $/Mtok$0.555$0.30
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Mistral Small 3.1 24B better than Step 3.5 Flash for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Mistral Small 3.1 24B for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Mistral Small 3.1 24B or Step 3.5 Flash?

Mistral Small 3.1 24B costs $0.351 per million input tokens and $0.555 per million output tokens; Step 3.5 Flash costs $0.10 and $0.30. Cost per solved task is known for neither of them.

Which has the bigger context window, Mistral Small 3.1 24B or Step 3.5 Flash?

Step 3.5 Flash, with 262K tokens against 128K.

How many benchmarks is the Mistral Small 3.1 24B vs Step 3.5 Flash comparison based on?

28 benchmarks have a result for both models as of October 21, 2026. Mistral Small 3.1 24B's coding index rests on 0 independent benchmarks and Step 3.5 Flash's on 0. Where only one model has a result, the page says so instead of naming a winner.

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