Noometry

Model comparison

Qwen3.5-Flash vs Solar Pro4

Qwen3.5-Flash and Solar Pro4 score almost the same on the Noometry Index (42.5 vs 42.1), so choose on price, context window or the category you care about most.

Last verified . 18 shared benchmarks.

Qwen3.5-Flash Alibaba (Qwen)

42.5

Rank #112 Confirmed

Solar Pro4 Upstage

42.1

Rank #121 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Qwen3.5-Flash scores higher in 5 categories and Solar Pro4 in 3 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in coding, where Solar Pro4 leads 40.1 to 34.2.
  • Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.30 / $1.20 for Solar Pro4.
  • Qwen3.5-Flash accepts more context: 1M tokens versus 524K.

Side by side

Qwen3.5-FlashSolar Pro4
ProviderAlibaba (Qwen)Upstage
Noometry Index42.542.1
Released2026-02-232026-08-06
WeightsProprietaryProprietary
Context window1M524K
Max output66K131K
Input $ / M tokens$0.10$0.30
Output $ / M tokens$0.40$1.20
Results tracked3218

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Category by category

Coding Solar Pro4 leads

Qwen3.5-Flash: 34.2 (#242), Solar Pro4: 40.1 (#149)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena WebDev12441371
LMArena Coding14121437
ALE-Bench221.8—

Agentic & Tool Use Not comparable

Qwen3.5-Flash: —, Solar Pro4: —

BenchmarkQwen3.5-FlashSolar Pro4
Vending-Bench 2462.69—

Reasoning Qwen3.5-Flash leads

Qwen3.5-Flash: 33.7 (#72), Solar Pro4: 28.5 (#104)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Hard Prompts14031399
Chess Puzzles21%—
Mystery Game Puzzles20%—
DTBench82.9%—
LMCA29.1%—
Epoch Capabilities Index143.98—

Math Solar Pro4 leads

Qwen3.5-Flash: 37.4 (#158), Solar Pro4: 38.8 (#128)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Math14071416
FrontierMath (Tiers 1-3)18.2%—
OTIS Mock AIME 2024-202584.4%—
FrontierMath (Feb 2025 set)6.2%—
FrontierMath Tier 4 (v1)0%—

Knowledge Qwen3.5-Flash leads

Qwen3.5-Flash: 43.2 (#93), Solar Pro4: 39.8 (#129)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Expert14071427
GPQA Diamond82.3%—
SimpleQA Verified20.3%—
Vectara Hallucination Rate10.5%—

Multilingual Qwen3.5-Flash leads

Qwen3.5-Flash: 50.5 (#121), Solar Pro4: 48.7 (#139)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Non-English13851361
LMArena Chinese14461415
LMArena French14121397
LMArena German13901364
LMArena Japanese13681309
LMArena Korean13441382
LMArena Russian13791360
LMArena Spanish14001401

Instruction Following Too close to call

Qwen3.5-Flash: 72.6 (#139), Solar Pro4: 72.7 (#132)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Instruction Following13741377

Long Context Too close to call

Qwen3.5-Flash: 42.4 (#124), Solar Pro4: 42.1 (#130)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Longer Query13921381

Writing & Preference Qwen3.5-Flash leads

Qwen3.5-Flash: 57.9 (#122), Solar Pro4: 56.5 (#138)

BenchmarkQwen3.5-FlashSolar Pro4
LMArena Text13971386
LMArena Creative Writing13431316
LMArena Multi-Turn13931385

Frequently asked questions

Is Qwen3.5-Flash better than Solar Pro4?

Qwen3.5-Flash and Solar Pro4 score almost the same on the Noometry Index (42.5 vs 42.1), so choose on price, context window or the category you care about most.

Which is cheaper, Qwen3.5-Flash or Solar Pro4?

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Solar Pro4 lists at $0.30 and $1.20.

Is Qwen3.5-Flash or Solar Pro4 better for coding?

Solar Pro4 scores higher on coding benchmarks: 40.1 versus 34.2 in the Noometry coding category.

Which has the bigger context window?

Qwen3.5-Flash does, with 1M tokens against 524K.

How many benchmarks do Qwen3.5-Flash and Solar Pro4 share?

18 benchmarks have published results for both models. Qwen3.5-Flash has 32 scored results on Noometry and Solar Pro4 has 18.

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