Noometry

Model comparison

Qwen3.5-Flash vs Qwen3.5 Plus

Qwen3.5-Flash and Qwen3.5 Plus score almost the same on the Noometry Index (42.5 vs 42.9), so choose on price, context window or the category you care about most.

Last verified . 13 shared benchmarks.

Qwen3.5-Flash Alibaba (Qwen)

42.5

Rank #112 Confirmed

Qwen3.5 Plus Alibaba (Qwen)

42.9

Rank #106 Confirmed

Summary

  • They share 13 benchmarks with published results for both. Qwen3.5-Flash scores higher in 1 category and Qwen3.5 Plus in 3 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in math, where Qwen3.5 Plus leads 49.6 to 37.4.
  • The biggest single-benchmark swing is LMCA: 29.1% for Qwen3.5-Flash and 36.4% for Qwen3.5 Plus.
  • Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $0.40 / $2.40 for Qwen3.5 Plus.

Side by side

Qwen3.5-FlashQwen3.5 Plus
ProviderAlibaba (Qwen)Alibaba (Qwen)
Noometry Index42.542.9
Released2026-02-232026-02-16
WeightsProprietaryProprietary
Context window1M1M
Max output66K66K
Input $ / M tokens$0.10$0.40
Output $ / M tokens$0.40$2.40
Results tracked3215

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

Qwen3.5-Flash: 34.2 (#242), Qwen3.5 Plus: —

BenchmarkQwen3.5-FlashQwen3.5 Plus
ALE-Bench221.8621.92
LMArena WebDev1244—
LMArena Coding1412—

Agentic & Tool Use Not comparable

Qwen3.5-Flash: —, Qwen3.5 Plus: —

BenchmarkQwen3.5-FlashQwen3.5 Plus
Vending-Bench 2462.690.54

Reasoning Too close to call

Qwen3.5-Flash: 33.7 (#72), Qwen3.5 Plus: 32.8 (#74)

BenchmarkQwen3.5-FlashQwen3.5 Plus
Chess Puzzles21%22%
Mystery Game Puzzles20%17%
DTBench82.9%80.5%
LMCA29.1%36.4%
Epoch Capabilities Index143.98146.78
LMArena Hard Prompts1403—

Math Qwen3.5 Plus leads

Qwen3.5-Flash: 37.4 (#158), Qwen3.5 Plus: 49.6 (#61)

BenchmarkQwen3.5-FlashQwen3.5 Plus
OTIS Mock AIME 2024-202584.4%86.7%
FrontierMath (Feb 2025 set)6.2%21%
FrontierMath Tier 4 (v1)0%2.1%
FrontierMath (Tiers 1-3)18.2%—
LMArena Math1407—

Knowledge Qwen3.5 Plus leads

Qwen3.5-Flash: 43.2 (#93), Qwen3.5 Plus: 46.0 (#83)

BenchmarkQwen3.5-FlashQwen3.5 Plus
GPQA Diamond82.3%84.8%
SimpleQA Verified20.3%25.4%
Vectara Hallucination Rate10.5%10.7%
LMArena Expert1407—

Multilingual Not comparable

Qwen3.5-Flash: 50.5 (#121), Qwen3.5 Plus: —

BenchmarkQwen3.5-FlashQwen3.5 Plus
LMArena Non-English1385—
LMArena Chinese1446—
LMArena French1412—
LMArena German1390—
LMArena Japanese1368—
LMArena Korean1344—
LMArena Russian1379—
LMArena Spanish1400—

Instruction Following Not comparable

Qwen3.5-Flash: 72.6 (#139), Qwen3.5 Plus: —

BenchmarkQwen3.5-FlashQwen3.5 Plus
LMArena Instruction Following1374—

Long Context Too close to call

Qwen3.5-Flash: 42.4 (#124), Qwen3.5 Plus: 43.0 (#113)

BenchmarkQwen3.5-FlashQwen3.5 Plus
CL-bench—19.8%
CL-bench Life—12.4%
LMArena Longer Query1392—

Writing & Preference Not comparable

Qwen3.5-Flash: 57.9 (#122), Qwen3.5 Plus: —

BenchmarkQwen3.5-FlashQwen3.5 Plus
LMArena Text1397—
LMArena Creative Writing1343—
LMArena Multi-Turn1393—

Frequently asked questions

Is Qwen3.5-Flash better than Qwen3.5 Plus?

Qwen3.5-Flash and Qwen3.5 Plus score almost the same on the Noometry Index (42.5 vs 42.9), so choose on price, context window or the category you care about most.

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

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; Qwen3.5 Plus lists at $0.40 and $2.40.

Which has the bigger context window?

Both accept 1M tokens.

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

13 benchmarks have published results for both models. Qwen3.5-Flash has 32 scored results on Noometry and Qwen3.5 Plus has 15.

Related comparisons

Go deeper