Model comparison

Mistral Medium 3.5 vs Solar Pro4

Solar Pro4 is the stronger model overall, scoring 42.1 to 40.2 on the Noometry Index.

Last verified October 10, 2026. 17 shared benchmarks.

Mistral Medium 3.5

Mistral AI

40.2

Rank #152 Confirmed

Solar Pro4

Upstage

42.1

Rank #121 Confirmed

Summary

They share 17 benchmarks with published results for both. Mistral Medium 3.5 scores higher in 6 categories and Solar Pro4 in 2 categories; 6 gaps are clear of the uncertainty.
The widest gap is in reasoning, where Solar Pro4 leads 28.5 to 17.3.
Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.50 / $7.50 for Mistral Medium 3.5.
Solar Pro4 accepts more context: 524K tokens versus 262K.
Mistral Medium 3.5 has downloadable open weights; the other is API-only.

Side by side

Mistral Medium 3.5 and Solar Pro4 specifications
	Mistral Medium 3.5	Solar Pro4
Provider	Mistral AI	Upstage
Noometry Index	40.2	42.1
Released	—	2026-08-06
Weights	Open	Proprietary
Context window	262K	524K
Max output	210K	131K
Input $ / M tokens	$1.50	$0.30
Output $ / M tokens	$7.50	$1.20
Results tracked	22	18

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Category by category

Coding Solar Pro4 leads

Mistral Medium 3.5: 36.0 (#213), Solar Pro4: 40.1 (#149)

Coding benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena WebDev	1264	1371
LMArena Coding	1461	1437

Reasoning Solar Pro4 leads

Mistral Medium 3.5: 17.3 (#295), Solar Pro4: 28.5 (#104)

Reasoning benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Hard Prompts	1436	1399
Kagi LLM Benchmark	41.4%	—
NYT Connections (extended)	12.9%	—
Epoch Capabilities Index	141.35	—

Math Too close to call

Mistral Medium 3.5: 39.1 (#113), Solar Pro4: 38.8 (#128)

Math benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Math	1431	1416

Knowledge Too close to call

Mistral Medium 3.5: 40.0 (#126), Solar Pro4: 39.8 (#129)

Knowledge benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Expert	1432	1427

Multimodal Not comparable

Mistral Medium 3.5: 38.3 (#65), Solar Pro4: —

Multimodal benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Vision	1223	—

Multilingual Mistral Medium 3.5 leads

Mistral Medium 3.5: 51.9 (#100), Solar Pro4: 48.7 (#139)

Multilingual benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Non-English	1404	1361
LMArena Chinese	1442	1415
LMArena French	1448	1397
LMArena German	1451	1364
LMArena Korean	1385	1382
LMArena Russian	1395	1360
LMArena Spanish	1409	1401
LMArena Japanese	—	1309

Instruction Following Mistral Medium 3.5 leads

Mistral Medium 3.5: 74.6 (#90), Solar Pro4: 72.7 (#132)

Instruction Following benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Instruction Following	1415	1377

Long Context Mistral Medium 3.5 leads

Mistral Medium 3.5: 43.2 (#103), Solar Pro4: 42.1 (#130)

Long Context benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Longer Query	1415	1381

Writing & Preference Mistral Medium 3.5 leads

Mistral Medium 3.5: 58.5 (#117), Solar Pro4: 56.5 (#138)

Writing & Preference benchmarks
Benchmark	Mistral Medium 3.5	Solar Pro4
LMArena Text	1421	1386
LMArena Creative Writing	1374	1316
LMArena Multi-Turn	1423	1385
EQ-Bench 4	993	—

Frequently asked questions

Is Mistral Medium 3.5 better than Solar Pro4?

Solar Pro4 is the stronger model overall, scoring 42.1 to 40.2 on the Noometry Index.

Which is cheaper, Mistral Medium 3.5 or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Mistral Medium 3.5 lists at $1.50 and $7.50.

Is Mistral Medium 3.5 or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 36.0 in the Noometry coding category.

Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 262K.

How many benchmarks do Mistral Medium 3.5 and Solar Pro4 share?

17 benchmarks have published results for both models. Mistral Medium 3.5 has 22 scored results on Noometry and Solar Pro4 has 18.