Noometry

Model comparison

GLM-5 vs Grok 4 Fast

GLM-5 is the stronger model overall, scoring 46.1 to 39.4 on the Noometry Index.

Last verified . 26 shared benchmarks.

GLM-5 Z.ai (Zhipu)

46.1

Rank #66 Confirmed

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Summary

  • They share 26 benchmarks with published results for both. GLM-5 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 leads 52.3 to 32.0.
  • The biggest single-benchmark swing is Vectara Hallucination Rate: 10.1% for GLM-5 and 19.7% for Grok 4 Fast.
  • GLM-5 has downloadable open weights; the other is API-only.

Side by side

GLM-5Grok 4 Fast
ProviderZ.ai (Zhipu)xAI
Noometry Index46.139.4
Released2026-02-112025-09-19
WeightsOpenProprietary
Context window205K—
Max output131K—
Input $ / M tokens$1—
Output $ / M tokens$3.20—
Results tracked4530

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Category by category

Coding GLM-5 leads

GLM-5: 49.0 (#52), Grok 4 Fast: 32.5 (#271)

BenchmarkGLM-5Grok 4 Fast
LMArena WebDev14341159
WeirdML48.2%42.9%
LMArena Coding14611429
SWE-bench Verified72.1%—
SWE-bench Verified (bash only)72.8%—
SWE-bench Multilingual69.7%—
ALE-Bench765.62—

Agentic & Tool Use GLM-5 leads

GLM-5: 31.1 (#71), Grok 4 Fast: 29.5 (#86)

BenchmarkGLM-5Grok 4 Fast
τ²-bench Banking9.8%15.7%
Terminal-Bench52.4%—
τ²-bench Airline82.5%—
τ²-bench Retail73.7%—
τ²-bench Telecom86.8%—
Cybench—30%
LMArena Search—1171
Vending-Bench 24,432—

Reasoning GLM-5 leads

GLM-5: 27.6 (#116), Grok 4 Fast: 22.2 (#201)

BenchmarkGLM-5Grok 4 Fast
ARC-AGI-24.9%5.3%
Kagi LLM Benchmark75%66.1%
ARC-AGI-144.7%48.5%
LMArena Hard Prompts14521412
Epoch Capabilities Index145.83144.2
ForecastBench6160.5
SimpleBench53.2%—
NYT Connections (extended)74.8%—
Chess Puzzles10%—
DTBench—82.7%

Math GLM-5 leads

GLM-5: 46.4 (#71), Grok 4 Fast: 38.9 (#123)

BenchmarkGLM-5Grok 4 Fast
LMArena Math14401419
MathArena Final-Answer Competitions65.7%—
OTIS Mock AIME 2024-202580%—
FrontierMath (Feb 2025 set)16.4%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge GLM-5 leads

GLM-5: 52.3 (#64), Grok 4 Fast: 32.0 (#214)

BenchmarkGLM-5Grok 4 Fast
Vectara Hallucination Rate10.1%19.7%
LMArena Expert14541411
GPQA Diamond87.8%—

Multilingual GLM-5 leads

GLM-5: 53.7 (#58), Grok 4 Fast: 51.3 (#111)

BenchmarkGLM-5Grok 4 Fast
LMArena Non-English14301396
LMArena Chinese15111457
LMArena French14551431
LMArena German14451383
LMArena Japanese14161352
LMArena Korean14231357
LMArena Russian14361389
LMArena Spanish14541415

Instruction Following GLM-5 leads

GLM-5: 75.2 (#67), Grok 4 Fast: 73.2 (#121)

BenchmarkGLM-5Grok 4 Fast
LMArena Instruction Following14281387

Long Context Grok 4 Fast leads

GLM-5: 44.7 (#60), Grok 4 Fast: 63.2 (#3)

BenchmarkGLM-5Grok 4 Fast
LMArena Longer Query14461415
Fiction.LiveBench—94.4%
CL-bench18.7%—

Writing & Preference GLM-5 leads

GLM-5: 66.0 (#38), Grok 4 Fast: 60.0 (#102)

BenchmarkGLM-5Grok 4 Fast
LMArena Text14461407
LMArena Creative Writing14391387
LMArena Multi-Turn14561414
EQ-Bench Creative Writing1601—

Frequently asked questions

Is GLM-5 better than Grok 4 Fast?

GLM-5 is the stronger model overall, scoring 46.1 to 39.4 on the Noometry Index.

Is GLM-5 or Grok 4 Fast better for coding?

GLM-5 scores higher on coding benchmarks: 49.0 versus 32.5 in the Noometry coding category.

How many benchmarks do GLM-5 and Grok 4 Fast share?

26 benchmarks have published results for both models. GLM-5 has 45 scored results on Noometry and Grok 4 Fast has 30.

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