Noometry

Model comparison

Grok 4 Fast vs Qwen3.5 35B-A3B

Qwen3.5 35B-A3B is the stronger model overall, scoring 42.0 to 39.4 on the Noometry Index.

Last verified . 21 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Qwen3.5 35B-A3B Alibaba (Qwen)

42.0

Rank #123 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Grok 4 Fast scores higher in 4 categories and Qwen3.5 35B-A3B in 4 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 42.4.
  • The biggest single-benchmark swing is Vectara Hallucination Rate: 19.7% for Grok 4 Fast and 10.5% for Qwen3.5 35B-A3B.
  • Qwen3.5 35B-A3B has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastQwen3.5 35B-A3B
ProviderxAIAlibaba (Qwen)
Noometry Index39.442.0
Released2025-09-192026-02-01
WeightsProprietaryOpen
Context window—262K
Max output—66K
Input $ / M tokens—$0.25
Output $ / M tokens—$2
Results tracked3028

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

Category by category

Coding Qwen3.5 35B-A3B leads

Grok 4 Fast: 32.5 (#271), Qwen3.5 35B-A3B: 33.8 (#251)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena WebDev11591254
LMArena Coding14291410
SciCode—29.3%
WeirdML42.9%—

Agentic & Tool Use Not comparable

Grok 4 Fast: 29.5 (#86), Qwen3.5 35B-A3B: —

BenchmarkGrok 4 FastQwen3.5 35B-A3B
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Qwen3.5 35B-A3B leads

Grok 4 Fast: 22.2 (#201), Qwen3.5 35B-A3B: 24.6 (#161)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena Hard Prompts14121400
DTBench82.7%80%
Epoch Capabilities Index144.2142.52
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—
CritPt—0.6%
Chess Puzzles—10%
LMCA—29.5%
ForecastBench60.5—

Math Qwen3.5 35B-A3B leads

Grok 4 Fast: 38.9 (#123), Qwen3.5 35B-A3B: 39.9 (#97)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena Math14191404
MathArena Final-Answer Competitions—56%
OTIS Mock AIME 2024-2025—70%

Knowledge Qwen3.5 35B-A3B leads

Grok 4 Fast: 32.0 (#214), Qwen3.5 35B-A3B: 47.8 (#79)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
Vectara Hallucination Rate19.7%10.5%
LMArena Expert14111408
GPQA Diamond—83.5%

Multilingual Grok 4 Fast leads

Grok 4 Fast: 51.3 (#111), Qwen3.5 35B-A3B: 50.0 (#127)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena Non-English13961378
LMArena Chinese14571457
LMArena French14311412
LMArena German13831367
LMArena Japanese13521325
LMArena Korean13571356
LMArena Russian13891376
LMArena Spanish14151392

Instruction Following Too close to call

Grok 4 Fast: 73.2 (#121), Qwen3.5 35B-A3B: 72.8 (#128)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena Instruction Following13871379

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Qwen3.5 35B-A3B: 42.4 (#127)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena Longer Query14151389
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 Fast leads

Grok 4 Fast: 60.0 (#102), Qwen3.5 35B-A3B: 57.9 (#124)

BenchmarkGrok 4 FastQwen3.5 35B-A3B
LMArena Text14071395
LMArena Creative Writing13871346
LMArena Multi-Turn14141390

Frequently asked questions

Is Grok 4 Fast better than Qwen3.5 35B-A3B?

Qwen3.5 35B-A3B is the stronger model overall, scoring 42.0 to 39.4 on the Noometry Index.

Is Grok 4 Fast or Qwen3.5 35B-A3B better for coding?

Qwen3.5 35B-A3B scores higher on coding benchmarks: 33.8 versus 32.5 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Qwen3.5 35B-A3B share?

21 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Qwen3.5 35B-A3B has 28.

Related comparisons

Go deeper