Noometry

Model comparison

GLM-5.3-Flash vs Grok 4 Fast

GLM-5.3-Flash is the stronger model overall, scoring 49.6 to 39.0 on the Noometry Index.

Last verified . 19 shared benchmarks.

GLM-5.3-Flash Z.ai (Zhipu)

49.6

Rank #45 Confirmed

Grok 4 Fast xAI

39.0

Rank #164 Confirmed

Summary

  • They share 19 benchmarks with published results for both. GLM-5.3-Flash scores higher in 8 categories and Grok 4 Fast in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GLM-5.3-Flash leads 58.4 to 31.5.
  • GLM-5.3-Flash has downloadable open weights; the other is API-only.

Side by side

GLM-5.3-FlashGrok 4 Fast
ProviderZ.ai (Zhipu)xAI
Noometry Index49.639.0
Released2026-08-202025-09-19
WeightsOpenProprietary
Context window1M—
Max output131K—
Input $ / M tokens$0.15—
Output $ / M tokens$0.50—
Results tracked3630

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Category by category

Coding GLM-5.3-Flash leads

GLM-5.3-Flash: 53.7 (#26), Grok 4 Fast: 32.3 (#264)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena WebDev16141160
LMArena Coding15061429
DeepSWE63.4%—
FrontierCode31.8%—
SciCode51.6%—
WeirdML—42.9%
ALE-Bench303.55—

Agentic & Tool Use GLM-5.3-Flash leads

GLM-5.3-Flash: 34.3 (#41), Grok 4 Fast: 29.3 (#80)

BenchmarkGLM-5.3-FlashGrok 4 Fast
APEX-Agents52.8%—
τ²-bench Banking—15.7%
Cybench—30%
GDP.pdf14%—
LMArena Search—1171

Reasoning GLM-5.3-Flash leads

GLM-5.3-Flash: 31.7 (#69), Grok 4 Fast: 22.5 (#179)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Hard Prompts14901413
Epoch Capabilities Index151.9144.21
ARC-AGI-2—5.3%
Kagi LLM Benchmark—66.1%
ARC-AGI-1—48.5%
CritPt15.4%—
Chess Puzzles14%—
Mystery Game Puzzles8%—
DTBench—82.7%
Surface Evolver Bench52.5%—
Bench to the Future 30.15—
ForecastBench—60.5

Math GLM-5.3-Flash leads

GLM-5.3-Flash: 53.1 (#38), Grok 4 Fast: 36.1 (#126)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Math14991419
FrontierMath (Tiers 1-3)55.8%—
FrontierMath Tier 417.1%—
OTIS Mock AIME 2024-202593.9%—
ProofBench21%—

Knowledge GLM-5.3-Flash leads

GLM-5.3-Flash: 58.4 (#33), Grok 4 Fast: 31.5 (#211)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Expert15121411
GPQA Diamond90.2%—
Vectara Hallucination Rate—19.7%

Multimodal Not comparable

GLM-5.3-Flash: 42.6 (#25), Grok 4 Fast: —

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Vision1304—

Multilingual GLM-5.3-Flash leads

GLM-5.3-Flash: 56.2 (#24), Grok 4 Fast: 51.5 (#106)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Non-English14621397
LMArena Chinese15291458
LMArena French14951433
LMArena German14571383
LMArena Japanese14201358
LMArena Korean14431359
LMArena Russian14721387
LMArena Spanish14711414

Instruction Following GLM-5.3-Flash leads

GLM-5.3-Flash: 77.8 (#17), Grok 4 Fast: 73.4 (#116)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Instruction Following14801388

Long Context Grok 4 Fast leads

GLM-5.3-Flash: 45.3 (#41), Grok 4 Fast: 63.2 (#3)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Longer Query14791415
Fiction.LiveBench—94.4%

Writing & Preference GLM-5.3-Flash leads

GLM-5.3-Flash: 65.4 (#49), Grok 4 Fast: 60.2 (#96)

BenchmarkGLM-5.3-FlashGrok 4 Fast
LMArena Text14711407
LMArena Creative Writing14401388
LMArena Multi-Turn14711414

Frequently asked questions

Is GLM-5.3-Flash better than Grok 4 Fast?

GLM-5.3-Flash is the stronger model overall, scoring 49.6 to 39.0 on the Noometry Index.

Is GLM-5.3-Flash or Grok 4 Fast better for coding?

GLM-5.3-Flash scores higher on coding benchmarks: 53.7 versus 32.3 in the Noometry coding category.

How many benchmarks do GLM-5.3-Flash and Grok 4 Fast share?

19 benchmarks have published results for both models. GLM-5.3-Flash has 36 scored results on Noometry and Grok 4 Fast has 30.

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