Model comparison

Qwen3.5 397B-A17B vs Solar Pro4

Qwen3.5 397B-A17B is the stronger model overall, scoring 45.7 to 41.5 on the Noometry Index. Solar Pro4 costs 2.6× less per token, which makes it the better buy when Qwen3.5 397B-A17B's lead doesn't matter for your workload.

Last verified October 10, 2026. 18 shared benchmarks.

Qwen3.5 397B-A17B

Alibaba (Qwen)

45.7

Rank #60 Confirmed

Solar Pro4

Upstage

41.5

Rank #123 Confirmed

Summary

They share 18 benchmarks with published results for both. Qwen3.5 397B-A17B scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
The widest gap is in knowledge, where Qwen3.5 397B-A17B leads 53.3 to 39.0.
Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $0.60 / $3.60 for Qwen3.5 397B-A17B.
Solar Pro4 accepts more context: 524K tokens versus 262K.
Qwen3.5 397B-A17B has downloadable open weights; the other is API-only.

Side by side

Qwen3.5 397B-A17B and Solar Pro4 specifications
	Qwen3.5 397B-A17B	Solar Pro4
Provider	Alibaba (Qwen)	Upstage
Noometry Index	45.7	41.5
Released	2026-02-01	2026-08-06
Weights	Open	Proprietary
Context window	262K	524K
Max output	66K	131K
Input $ / M tokens	$0.60	$0.30
Output $ / M tokens	$3.60	$1.20
Results tracked	36	18

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Category by category

Coding Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 41.7 (#108), Solar Pro4: 39.9 (#135)

Coding benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena WebDev	1400	1371
LMArena Coding	1464	1439

Agentic & Tool Use Not comparable

Qwen3.5 397B-A17B: 33.2 (#51), Solar Pro4: —

Agentic & Tool Use benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
APEX-Agents	24.9%	—
τ²-bench Airline	81.5%	—
τ²-bench Banking	9.8%	—
τ²-bench Retail	84.4%	—
τ²-bench Telecom	97.8%	—

Reasoning Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 33.6 (#62), Solar Pro4: 27.3 (#107)

Reasoning benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Hard Prompts	1448	1398
Kagi LLM Benchmark	73.7%	—
NYT Connections (extended)	58.9%	—
Chess Puzzles	13%	—
Thematic Generalization	65.1%	—
Mystery Game Puzzles	18%	—
DTBench	87.5%	—
LMCA	37.9%	—
Epoch Capabilities Index	146.64	—

Math Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 44.9 (#64), Solar Pro4: 36.1 (#129)

Math benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Math	1455	1418
FrontierMath (Tiers 1-3)	31.2%	—
OTIS Mock AIME 2024-2025	88.9%	—

Knowledge Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 53.3 (#53), Solar Pro4: 39.0 (#128)

Knowledge benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Expert	1461	1421
GPQA Diamond	86.4%	—

Multimodal Not comparable

Qwen3.5 397B-A17B: 40.0 (#42), Solar Pro4: —

Multimodal benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Vision	1262	—

Multilingual Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 54.0 (#56), Solar Pro4: 49.0 (#134)

Multilingual benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Non-English	1431	1362
LMArena Chinese	1501	1417
LMArena French	1461	1403
LMArena German	1447	1351
LMArena Japanese	1427	1300
LMArena Korean	1382	1383
LMArena Russian	1429	1360
LMArena Spanish	1443	1408

Instruction Following Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 75.2 (#73), Solar Pro4: 72.8 (#128)

Instruction Following benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Instruction Following	1424	1376

Long Context Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 44.1 (#71), Solar Pro4: 42.0 (#125)

Long Context benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Longer Query	1442	1379

Writing & Preference Qwen3.5 397B-A17B leads

Qwen3.5 397B-A17B: 62.5 (#74), Solar Pro4: 56.7 (#133)

Writing & Preference benchmarks
Benchmark	Qwen3.5 397B-A17B	Solar Pro4
LMArena Text	1438	1386
LMArena Creative Writing	1401	1313
LMArena Multi-Turn	1447	1391
EQ-Bench Creative Writing	1478	—

Frequently asked questions

Is Qwen3.5 397B-A17B better than Solar Pro4?

Which is cheaper, Qwen3.5 397B-A17B or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Qwen3.5 397B-A17B lists at $0.60 and $3.60.

Is Qwen3.5 397B-A17B or Solar Pro4 better for coding?

Qwen3.5 397B-A17B scores higher on coding benchmarks: 41.7 versus 39.9 in the Noometry coding category.

Which has the bigger context window?

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

How many benchmarks do Qwen3.5 397B-A17B and Solar Pro4 share?

18 benchmarks have published results for both models. Qwen3.5 397B-A17B has 36 scored results on Noometry and Solar Pro4 has 18.