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Mistral Medium 3.1 vs Solar Pro 4

Solar Pro 4 leads Mistral Medium 3.1 on the Artificial Analysis Intelligence Index, 28.2 to 9.2, and Solar Pro 4 costs 3.3x less per output token ($0.60 vs $2.00 per million). Updated October 21, 2026; 41 benchmarks have a result for both.

Replace Mistral Medium 3.1 Replace Solar Pro 4
Mistral Medium 3.1Mistral AI
Coding
No data
Overall
No data
Output $/M
$2.00
24
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
17
vs boards won of 41 shared

Mistral Medium 3.1 or Solar Pro 4: which to pick

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

Pick Mistral Medium 3.1 for work measured by AA Coding Index or SciCode, where it leads.

Model AMistral Medium 3.1Mistral AINot benchmarkedNo coding benchmarkNo cost per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
41
Mistral Medium 3.1 only
33
Solar Pro 4 only
4
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 Medium 3.1 not benchmarked, Solar Pro 4 not benchmarked.
Widest category
Intelligence, 19.0 points apart on average over 1 shared benchmark.
Widest single gap
AA Coding Index: Mistral Medium 3.1 20.5 against Solar Pro 4 52.7, 32.2 points apart on a 0 to 100 scale.
Output price
Mistral Medium 3.1 $2.00 against Solar Pro 4 $0.60 per million output tokens, 3.3x apart.
Context window
Mistral Medium 3.1 takes 131K tokens, Solar Pro 4 524K.

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 Medium 3.1BarsSolar Pro 4Ties
Coding23
Intelligence01
Reasoning23
Math02
Knowledge40
Web design06
General162
All shared boards2417
CodingLike-for-likeSix of these boards feed the Vibe Coding Index23
Coding benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
LMArena WebDevNot measured1371Only Solar Pro 4 measured
AA Coding Index20.552.7Solar Pro 4
LiveCodeBench (Vals AI)44.8%Not measuredOnly Mistral Medium 3.1 measured
LiveCodeBench (Artificial Analysis run)40.6%Not measuredOnly Mistral Medium 3.1 measured
SciCode32.4%48.0%Solar Pro 4
Terminal-Bench Hard (Artificial Analysis run)10.6%Not measuredOnly Mistral Medium 3.1 measured
ALE-Bench210.2179.3Mistral Medium 3.1
LMArena Text: coding14331438Solar Pro 4
LMArena Text: software and IT14361431Mistral Medium 3.1
LMArena WebDev: ReactNot measured1363Only Solar Pro 4 measured
LMArena WebDev: HTMLNot measured1371Only Solar Pro 4 measured
Neither model has a result on the other 28 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
AA Intelligence Index9.228.2Solar Pro 4
Neither model has a result on the other 1 board here
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index3 boards, none shared
Agentic work benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
AA Agentic Index1.9Not measuredOnly Mistral Medium 3.1 measured
Design Arena: agents building web appsNot measured1105Only Solar Pro 4 measured
τ²-Bench Telecom40.6%Not measuredOnly Mistral Medium 3.1 measured
Neither model has a result on the other 38 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index23
Reasoning benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
MMMU Pro (Vals AI)63.0%Not measuredOnly Mistral Medium 3.1 measured
GPQA Diamond (Artificial Analysis run)58.8%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)4.7%29.8%Solar Pro 4
LMArena Text: hard prompts14261400Mistral Medium 3.1
LMArena Text: expert14081428Solar Pro 4
LMArena Text: hard prompts in English14351427Mistral Medium 3.1
LMArena Vision: diagrams1175Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: homework1165Not measuredOnly Mistral Medium 3.1 measured
Neither model has a result on the other 14 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
AIME42.3%Not measuredOnly Mistral Medium 3.1 measured
MATH 500 (Vals AI)87.0%Not measuredOnly Mistral Medium 3.1 measured
MGSM (Vals AI)90.9%Not measuredOnly Mistral Medium 3.1 measured
AA Math Index38.3Not measuredOnly Mistral Medium 3.1 measured
AIME 2025 (Artificial Analysis run)38.3%Not measuredOnly Mistral Medium 3.1 measured
LMArena Text: math14081421Solar Pro 4
LMArena Text: mathematical work14121427Solar Pro 4
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
MMLU Pro75.3%Not measuredOnly Mistral Medium 3.1 measured
LegalBench (Vals AI)62.0%Not measuredOnly Mistral Medium 3.1 measured
CorpFin (Vals AI)50.7%Not measuredOnly Mistral Medium 3.1 measured
TaxEval (Vals AI)70.3%Not measuredOnly Mistral Medium 3.1 measured
MortgageTax (Vals AI)36.5%Not measuredOnly Mistral Medium 3.1 measured
MedQA (Vals AI)78.2%Not measuredOnly Mistral Medium 3.1 measured
MMLU Pro (Artificial Analysis run)68.3%Not measuredOnly Mistral Medium 3.1 measured
LMArena Text: science14441404Mistral Medium 3.1
LMArena Text: medicine and healthcare14491374Mistral Medium 3.1
LMArena Text: legal and government14391383Mistral Medium 3.1
LMArena Text: business and finance14181381Mistral Medium 3.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
Design Arena: websites11331176Solar Pro 4
Design Arena: UI components11001150Solar Pro 4
Design Arena: game dev10741170Solar Pro 4
Design Arena: data viz11441177Solar Pro 4
Design Arena: 3D10811178Solar Pro 4
Design Arena: all code categories11201182Solar Pro 4
Design Arena: SVG993Not measuredOnly Mistral Medium 3.1 measured
Design Arena: ASCII art997Not measuredOnly Mistral Medium 3.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index162
General benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
IFBench39.8%Not measuredOnly Mistral Medium 3.1 measured
Long context reasoning (AA-LCR)42.7%70.7%Solar Pro 4
DTBench67.5%Not measuredOnly Mistral Medium 3.1 measured
LMCA19.1%Not measuredOnly Mistral Medium 3.1 measured
LMArena Text14241388Mistral Medium 3.1
LMArena Text: instruction following13981375Mistral Medium 3.1
LMArena Text: creative writing13911317Mistral Medium 3.1
LMArena Vision1172Not measuredOnly Mistral Medium 3.1 measured
LMArena Text: English14381414Mistral Medium 3.1
LMArena Text: non-English14081363Mistral Medium 3.1
LMArena Text: Chinese14471422Mistral Medium 3.1
LMArena Text: German14321358Mistral Medium 3.1
LMArena Text: Japanese13791320Mistral Medium 3.1
LMArena Text: Korean13801383Solar Pro 4
LMArena Text: French14601400Mistral Medium 3.1
LMArena Text: Spanish14331409Mistral Medium 3.1
LMArena Text: Russian14111357Mistral Medium 3.1
LMArena Text: Polish14301304Mistral Medium 3.1
LMArena Text: multi-turn14181385Mistral Medium 3.1
LMArena Text: longer queries14061382Mistral Medium 3.1
LMArena Text: writing and language13951344Mistral Medium 3.1
LMArena Text: entertainment and media13901332Mistral Medium 3.1
LMArena Vision: English1179Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: Chinese1190Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: reading text1175Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: humor1168Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: captioning1145Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: recognizing things1147Not measuredOnly Mistral Medium 3.1 measured
LMArena Vision: creative writing1200Not measuredOnly Mistral Medium 3.1 measured
Neither model has a result on the other 17 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Mistral Medium 3.1 and Solar Pro 4
BenchmarkMistral Medium 3.1Solar Pro 4Leader
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 Medium 3.1$0.0014Fits in one request
Solar Pro 4$0.0004Fits in one request

Solar Pro 4 costs less

Repository review

50K input + 3K output tokens

Mistral Medium 3.1$0.026Fits in one request
Solar Pro 4$0.0093Fits in one request

Solar Pro 4 costs less

Agent loop

200K input + 10K output tokens

Mistral Medium 3.1$0.100Exceeds the context window
Solar Pro 4$0.036Fits in one request

Solar Pro 4 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 Medium 3.1 and Solar Pro 4
SpecificationMistral Medium 3.1Upstage Solar Pro 4
MakerMistral AIUpstage
WeightsNo public weights listedNo public weights listed
ReleasedAugust 13, 2025August 10, 2026
Context window131K524K
Input $/Mtok$0.40$0.15
Output $/Mtok$2.00$0.60
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Mistral Medium 3.1 better than Solar Pro 4 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Mistral Medium 3.1 for work measured by AA Coding Index or SciCode, where it leads.

Which is cheaper, Mistral Medium 3.1 or Solar Pro 4?

Mistral Medium 3.1 costs $0.40 per million input tokens and $2.00 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for neither of them.

Which has the bigger context window, Mistral Medium 3.1 or Solar Pro 4?

Solar Pro 4, with 524K tokens against 131K.

How many benchmarks is the Mistral Medium 3.1 vs Solar Pro 4 comparison based on?

41 benchmarks have a result for both models as of October 21, 2026. Mistral Medium 3.1's coding index rests on 0 independent benchmarks and Solar Pro 4's on 1. Where only one model has a result, the page says so instead of naming a winner.

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