Noometry

Model comparison

GLM-5.3-Flash vs Grok 4.5

Grok 4.5 is the stronger model overall, scoring 55.0 to 49.6 on the Noometry Index. GLM-5.3-Flash costs 13× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

Last verified . 34 shared benchmarks.

GLM-5.3-Flash Z.ai (Zhipu)

49.6

Rank #45 Confirmed

Grok 4.5 xAI

55.0

Rank #22 Confirmed

Summary

  • They share 34 benchmarks with published results for both. GLM-5.3-Flash scores higher in 5 categories and Grok 4.5 in 5 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.5 leads 56.0 to 31.7.
  • The biggest single-benchmark swing is Chess Puzzles: 14% for GLM-5.3-Flash and 36% for Grok 4.5.
  • GLM-5.3-Flash is cheaper at $0.15 / $0.50 per million input/output tokens, against $2 / $6 for Grok 4.5.
  • GLM-5.3-Flash accepts more context: 1M tokens versus 500K.
  • GLM-5.3-Flash has downloadable open weights; the other is API-only.

Side by side

GLM-5.3-FlashGrok 4.5
ProviderZ.ai (Zhipu)xAI
Noometry Index49.655.0
Released2026-08-202026-07-08
WeightsOpenProprietary
Context window1M500K
Max output131K500K
Input $ / M tokens$0.15$2
Output $ / M tokens$0.50$6
Results tracked3652

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Category by category

Coding GLM-5.3-Flash leads

GLM-5.3-Flash: 53.7 (#26), Grok 4.5: 51.7 (#34)

BenchmarkGLM-5.3-FlashGrok 4.5
DeepSWE63.4%53.8%
FrontierCode31.8%42.4%
LMArena WebDev16141552
SciCode51.6%54.1%
LMArena Coding15061473
ALE-Bench303.551,309
WeirdML—46.4%

Agentic & Tool Use Grok 4.5 leads

GLM-5.3-Flash: 34.3 (#41), Grok 4.5: 44.4 (#15)

BenchmarkGLM-5.3-FlashGrok 4.5
APEX-Agents52.8%56.2%
GDP.pdf14%14%
τ²-bench Banking—47.9%
PostTrainBench—23.4%
GBAEval—65.4%
LMArena Search—1213
Vending-Bench 2—3,887

Reasoning Grok 4.5 leads

GLM-5.3-Flash: 31.7 (#69), Grok 4.5: 56.0 (#23)

BenchmarkGLM-5.3-FlashGrok 4.5
CritPt15.4%15.4%
Chess Puzzles14%36%
LMArena Hard Prompts14901462
Surface Evolver Bench52.5%74.4%
Epoch Capabilities Index151.9154.02
ARC-AGI-2—52.6%
SimpleBench—70%
Kagi LLM Benchmark—83.5%
NYT Connections (extended)—79.9%
ARC-AGI-1—87.2%
Mystery Game Puzzles8%—
DTBench—96.5%
LMCA—45.2%
Bench to the Future 30.15—

Math Grok 4.5 leads

GLM-5.3-Flash: 53.1 (#38), Grok 4.5: 60.7 (#29)

BenchmarkGLM-5.3-FlashGrok 4.5
FrontierMath (Tiers 1-3)55.8%57.2%
FrontierMath Tier 417.1%24.4%
OTIS Mock AIME 2024-202593.9%97.8%
ProofBench21%31%
LMArena Math14991457

Knowledge Grok 4.5 leads

GLM-5.3-Flash: 58.4 (#33), Grok 4.5: 62.3 (#21)

BenchmarkGLM-5.3-FlashGrok 4.5
GPQA Diamond90.2%93.4%
LMArena Expert15121466
SimpleQA Verified—48.3%

Multimodal GLM-5.3-Flash leads

GLM-5.3-Flash: 42.6 (#25), Grok 4.5: 37.8 (#63)

BenchmarkGLM-5.3-FlashGrok 4.5
LMArena Vision13041287
Blueprint-Bench 2—27.3%
Furniture Assembly—22.5%
LMArena Document—1452

Multilingual GLM-5.3-Flash leads

GLM-5.3-Flash: 56.2 (#24), Grok 4.5: 54.5 (#43)

BenchmarkGLM-5.3-FlashGrok 4.5
LMArena Non-English14621439
LMArena Chinese15291497
LMArena French14951458
LMArena German14571448
LMArena Japanese14201425
LMArena Korean14431402
LMArena Russian14721447
LMArena Spanish14711452

Instruction Following GLM-5.3-Flash leads

GLM-5.3-Flash: 77.8 (#17), Grok 4.5: 76.3 (#45)

BenchmarkGLM-5.3-FlashGrok 4.5
LMArena Instruction Following14801446

Long Context Too close to call

GLM-5.3-Flash: 45.3 (#41), Grok 4.5: 44.8 (#54)

BenchmarkGLM-5.3-FlashGrok 4.5
LMArena Longer Query14791463

Writing & Preference Too close to call

GLM-5.3-Flash: 65.4 (#49), Grok 4.5: 65.9 (#40)

BenchmarkGLM-5.3-FlashGrok 4.5
LMArena Text14711448
LMArena Creative Writing14401442
LMArena Multi-Turn14711457
EQ-Bench Creative Writing—1579

Frequently asked questions

Is GLM-5.3-Flash better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 49.6 on the Noometry Index. GLM-5.3-Flash costs 13× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

Which is cheaper, GLM-5.3-Flash or Grok 4.5?

GLM-5.3-Flash is cheaper. It lists at $0.15 per million input tokens and $0.50 per million output tokens; Grok 4.5 lists at $2 and $6.

Is GLM-5.3-Flash or Grok 4.5 better for coding?

GLM-5.3-Flash scores higher on coding benchmarks: 53.7 versus 51.7 in the Noometry coding category.

Which has the bigger context window?

GLM-5.3-Flash does, with 1M tokens against 500K.

How many benchmarks do GLM-5.3-Flash and Grok 4.5 share?

34 benchmarks have published results for both models. GLM-5.3-Flash has 36 scored results on Noometry and Grok 4.5 has 52.

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