Noometry

Model comparison

Qwen Plus vs Qwen3.5-Flash

Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 37.1 on the Noometry Index.

Last verified . 18 shared benchmarks.

Qwen Plus Alibaba (Qwen)

37.1

Rank #210 Confirmed

Qwen3.5-Flash Alibaba (Qwen)

42.5

Rank #112 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Qwen Plus scores higher in 1 category and Qwen3.5-Flash in 7 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Qwen3.5-Flash leads 43.2 to 27.4.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 17.8% for Qwen Plus and 84.4% for Qwen3.5-Flash.
  • Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.40 / $1.20 for Qwen Plus.

Side by side

Qwen PlusQwen3.5-Flash
ProviderAlibaba (Qwen)Alibaba (Qwen)
Noometry Index37.142.5
Released2024-01-252026-02-23
WeightsProprietaryProprietary
Context window1M1M
Max output33K66K
Input $ / M tokens$0.40$0.10
Output $ / M tokens$1.20$0.40
Results tracked2032

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Category by category

Coding Qwen Plus leads

Qwen Plus: 38.9 (#167), Qwen3.5-Flash: 34.2 (#242)

BenchmarkQwen PlusQwen3.5-Flash
LMArena Coding13281412
LMArena WebDev—1244
ALE-Bench—221.8

Agentic & Tool Use Not comparable

Qwen Plus: —, Qwen3.5-Flash: —

BenchmarkQwen PlusQwen3.5-Flash
Vending-Bench 2—462.69

Reasoning Qwen3.5-Flash leads

Qwen Plus: 28.4 (#107), Qwen3.5-Flash: 33.7 (#72)

BenchmarkQwen PlusQwen3.5-Flash
LMArena Hard Prompts13171403
DTBench81.1%82.9%
LMCA24%29.1%
Kagi LLM Benchmark63.3%—
Chess Puzzles—21%
Mystery Game Puzzles—20%
Epoch Capabilities Index—143.98

Math Qwen3.5-Flash leads

Qwen Plus: 23.3 (#271), Qwen3.5-Flash: 37.4 (#158)

BenchmarkQwen PlusQwen3.5-Flash
OTIS Mock AIME 2024-202517.8%84.4%
LMArena Math13261407
FrontierMath (Feb 2025 set)1.7%6.2%
FrontierMath (Tiers 1-3)—18.2%
MATH Level 565.3%—
FrontierMath Tier 4 (v1)—0%

Knowledge Qwen3.5-Flash leads

Qwen Plus: 27.4 (#251), Qwen3.5-Flash: 43.2 (#93)

BenchmarkQwen PlusQwen3.5-Flash
GPQA Diamond48.1%82.3%
LMArena Expert13281407
SimpleQA Verified—20.3%
Vectara Hallucination Rate—10.5%

Multilingual Qwen3.5-Flash leads

Qwen Plus: 45.1 (#175), Qwen3.5-Flash: 50.5 (#121)

BenchmarkQwen PlusQwen3.5-Flash
LMArena Non-English13101385
LMArena Chinese13471446
LMArena Japanese12511368
LMArena Russian13231379
LMArena French—1412
LMArena German—1390
LMArena Korean—1344
LMArena Spanish—1400

Instruction Following Qwen3.5-Flash leads

Qwen Plus: 68.8 (#181), Qwen3.5-Flash: 72.6 (#139)

BenchmarkQwen PlusQwen3.5-Flash
LMArena Instruction Following13031374

Long Context Qwen3.5-Flash leads

Qwen Plus: 40.3 (#158), Qwen3.5-Flash: 42.4 (#124)

BenchmarkQwen PlusQwen3.5-Flash
LMArena Longer Query13241392

Writing & Preference Qwen3.5-Flash leads

Qwen Plus: 52.2 (#176), Qwen3.5-Flash: 57.9 (#122)

BenchmarkQwen PlusQwen3.5-Flash
LMArena Text13261397
LMArena Creative Writing12931343
LMArena Multi-Turn13361393

Frequently asked questions

Is Qwen Plus better than Qwen3.5-Flash?

Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 37.1 on the Noometry Index.

Which is cheaper, Qwen Plus or Qwen3.5-Flash?

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

Is Qwen Plus or Qwen3.5-Flash better for coding?

Qwen Plus scores higher on coding benchmarks: 38.9 versus 34.2 in the Noometry coding category.

Which has the bigger context window?

Both accept 1M tokens.

How many benchmarks do Qwen Plus and Qwen3.5-Flash share?

18 benchmarks have published results for both models. Qwen Plus has 20 scored results on Noometry and Qwen3.5-Flash has 32.

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