Noometry

Model comparison

Grok 4 Fast vs Qwen3.5 397B-A17B

Qwen3.5 397B-A17B is the stronger model overall, scoring 46.0 to 39.4 on the Noometry Index.

Last verified . 22 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Qwen3.5 397B-A17B Alibaba (Qwen)

46.0

Rank #67 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Qwen3.5 397B-A17B in 8 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Qwen3.5 397B-A17B leads 53.3 to 32.0.
  • The biggest single-benchmark swing is Kagi LLM Benchmark: 66.1% for Grok 4 Fast and 73.7% for Qwen3.5 397B-A17B.
  • Qwen3.5 397B-A17B has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastQwen3.5 397B-A17B
ProviderxAIAlibaba (Qwen)
Noometry Index39.446.0
Released2025-09-192026-02-01
WeightsProprietaryOpen
Context window—262K
Max output—66K
Input $ / M tokens—$0.60
Output $ / M tokens—$3.60
Results tracked3036

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Category by category

Coding Qwen3.5 397B-A17B leads

Grok 4 Fast: 32.5 (#271), Qwen3.5 397B-A17B: 42.0 (#114)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena WebDev11591400
LMArena Coding14291465
WeirdML42.9%—

Agentic & Tool Use Qwen3.5 397B-A17B leads

Grok 4 Fast: 29.5 (#86), Qwen3.5 397B-A17B: 33.3 (#53)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
τ²-bench Banking15.7%9.8%
APEX-Agents—24.9%
τ²-bench Airline—81.5%
τ²-bench Retail—84.4%
τ²-bench Telecom—97.8%
Cybench30%—
LMArena Search1171—

Reasoning Qwen3.5 397B-A17B leads

Grok 4 Fast: 22.2 (#201), Qwen3.5 397B-A17B: 34.5 (#70)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
Kagi LLM Benchmark66.1%73.7%
LMArena Hard Prompts14121448
DTBench82.7%87.5%
Epoch Capabilities Index144.2146.65
ARC-AGI-25.3%—
NYT Connections (extended)—58.9%
ARC-AGI-148.5%—
Chess Puzzles—13%
Thematic Generalization—65.1%
Mystery Game Puzzles—18%
LMCA—37.9%
ForecastBench60.5—

Math Qwen3.5 397B-A17B leads

Grok 4 Fast: 38.9 (#123), Qwen3.5 397B-A17B: 46.1 (#73)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Math14191454
FrontierMath (Tiers 1-3)—31.2%
OTIS Mock AIME 2024-2025—88.9%

Knowledge Qwen3.5 397B-A17B leads

Grok 4 Fast: 32.0 (#214), Qwen3.5 397B-A17B: 53.3 (#58)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Expert14111462
GPQA Diamond—86.4%
Vectara Hallucination Rate19.7%—

Multimodal Not comparable

Grok 4 Fast: —, Qwen3.5 397B-A17B: 40.7 (#44)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Vision—1263

Multilingual Qwen3.5 397B-A17B leads

Grok 4 Fast: 51.3 (#111), Qwen3.5 397B-A17B: 53.7 (#59)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Non-English13961430
LMArena Chinese14571500
LMArena French14311461
LMArena German13831447
LMArena Japanese13521426
LMArena Korean13571384
LMArena Russian13891429
LMArena Spanish14151441

Instruction Following Qwen3.5 397B-A17B leads

Grok 4 Fast: 73.2 (#121), Qwen3.5 397B-A17B: 75.0 (#77)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Instruction Following13871424

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Qwen3.5 397B-A17B: 44.1 (#74)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Longer Query14151442
Fiction.LiveBench94.4%—

Writing & Preference Qwen3.5 397B-A17B leads

Grok 4 Fast: 60.0 (#102), Qwen3.5 397B-A17B: 62.3 (#79)

BenchmarkGrok 4 FastQwen3.5 397B-A17B
LMArena Text14071438
LMArena Creative Writing13871401
LMArena Multi-Turn14141446
EQ-Bench Creative Writing—1478

Frequently asked questions

Is Grok 4 Fast better than Qwen3.5 397B-A17B?

Qwen3.5 397B-A17B is the stronger model overall, scoring 46.0 to 39.4 on the Noometry Index.

Is Grok 4 Fast or Qwen3.5 397B-A17B better for coding?

Qwen3.5 397B-A17B scores higher on coding benchmarks: 42.0 versus 32.5 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Qwen3.5 397B-A17B share?

22 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Qwen3.5 397B-A17B has 36.

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