Noometry

Model comparison

GLM-5.1 vs GLM-5.3-Flash

GLM-5.3-Flash is the stronger model overall, scoring 51.8 to 47.8 on the Noometry Index.

Last verified . 28 shared benchmarks.

GLM-5.1 Z.ai (Zhipu)

47.8

Rank #59 Confirmed

GLM-5.3-Flash Z.ai (Zhipu)

51.8

Rank #41 Confirmed

Summary

  • They share 28 benchmarks with published results for both. GLM-5.1 scores higher in 1 category and GLM-5.3-Flash in 8 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in agentic & tool use, where GLM-5.3-Flash leads 34.2 to 24.9.
  • The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 36.8% for GLM-5.1 and 55.8% for GLM-5.3-Flash.
  • GLM-5.3-Flash is cheaper at $0.15 / $0.50 per million input/output tokens, against $1.40 / $4.40 for GLM-5.1.
  • GLM-5.3-Flash accepts more context: 1M tokens versus 200K.

Side by side

GLM-5.1GLM-5.3-Flash
ProviderZ.ai (Zhipu)Z.ai (Zhipu)
Noometry Index47.851.8
Released2026-04-072026-08-20
WeightsOpenOpen
Context window200K1M
Max output131K131K
Input $ / M tokens$1.40$0.15
Output $ / M tokens$4.40$0.50
Results tracked4140

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Category by category

Coding GLM-5.3-Flash leads

GLM-5.1: 48.7 (#55), GLM-5.3-Flash: 53.1 (#31)

BenchmarkGLM-5.1GLM-5.3-Flash
LMArena WebDev15081609
SciCode43.8%51.6%
LMArena Coding14851508
ALE-Bench887.1303.55
SWE-bench Verified74.2%—
DeepSWE—63.4%
FrontierCode—31.8%
CursorBench—36.8%
FrontierSWE—18.1%
WeirdML57.1%—

Agentic & Tool Use GLM-5.3-Flash leads

GLM-5.1: 24.9 (#113), GLM-5.3-Flash: 34.2 (#47)

BenchmarkGLM-5.1GLM-5.3-Flash
APEX-Agents40.9%52.8%
ExploitBench18.1%—
GBAEval0%—
GDP.pdf—14%
Vending-Bench 25,634—

Reasoning GLM-5.3-Flash leads

GLM-5.1: 39.1 (#60), GLM-5.3-Flash: 48.0 (#42)

BenchmarkGLM-5.1GLM-5.3-Flash
CritPt4.6%15.4%
Chess Puzzles19%14%
LMArena Hard Prompts14721491
Epoch Capabilities Index149.84151.88
ARC-AGI-2—65.8%
SimpleBench55.1%—
NYT Connections (extended)77.7%—
ARC-AGI-1—91%
Thematic Generalization69.8%—
Mystery Game Puzzles—8%
Surface Evolver Bench—52.5%
Bench to the Future 3—0.15

Math GLM-5.3-Flash leads

GLM-5.1: 49.7 (#60), GLM-5.3-Flash: 53.3 (#47)

BenchmarkGLM-5.1GLM-5.3-Flash
FrontierMath (Tiers 1-3)36.8%55.8%
OTIS Mock AIME 2024-202593.3%93.9%
ProofBench22.2%21%
LMArena Math14731500
FrontierMath Tier 4—17.1%
MathArena Final-Answer Competitions67.1%—
FrontierMath (Feb 2025 set)33.4%—
FrontierMath Tier 4 (v1)12.5%—

Knowledge GLM-5.3-Flash leads

GLM-5.1: 54.9 (#50), GLM-5.3-Flash: 58.4 (#36)

BenchmarkGLM-5.1GLM-5.3-Flash
GPQA Diamond89.9%90.2%
LMArena Expert14761513
SimpleQA Verified34%—

Multimodal Not comparable

GLM-5.1: —, GLM-5.3-Flash: 42.8 (#27)

BenchmarkGLM-5.1GLM-5.3-Flash
LMArena Vision—1296

Multilingual GLM-5.3-Flash leads

GLM-5.1: 55.0 (#36), GLM-5.3-Flash: 56.0 (#25)

BenchmarkGLM-5.1GLM-5.3-Flash
LMArena Non-English14471462
LMArena Chinese15151527
LMArena French14741496
LMArena German14651470
LMArena Japanese14341429
LMArena Korean14181446
LMArena Russian14541469
LMArena Spanish14691471

Instruction Following GLM-5.3-Flash leads

GLM-5.1: 76.3 (#42), GLM-5.3-Flash: 77.5 (#20)

BenchmarkGLM-5.1GLM-5.3-Flash
LMArena Instruction Following14511478

Long Context Too close to call

GLM-5.1: 44.9 (#53), GLM-5.3-Flash: 45.4 (#39)

BenchmarkGLM-5.1GLM-5.3-Flash
LMArena Longer Query14661482

Writing & Preference GLM-5.1 leads

GLM-5.1: 66.9 (#31), GLM-5.3-Flash: 65.3 (#50)

BenchmarkGLM-5.1GLM-5.3-Flash
LMArena Text14611471
LMArena Creative Writing14531442
LMArena Multi-Turn14721467
EQ-Bench Creative Writing1592—

Frequently asked questions

Is GLM-5.1 better than GLM-5.3-Flash?

GLM-5.3-Flash is the stronger model overall, scoring 51.8 to 47.8 on the Noometry Index.

Which is cheaper, GLM-5.1 or GLM-5.3-Flash?

GLM-5.3-Flash is cheaper. It lists at $0.15 per million input tokens and $0.50 per million output tokens; GLM-5.1 lists at $1.40 and $4.40.

Is GLM-5.1 or GLM-5.3-Flash better for coding?

GLM-5.3-Flash scores higher on coding benchmarks: 53.1 versus 48.7 in the Noometry coding category.

Which has the bigger context window?

GLM-5.3-Flash does, with 1M tokens against 200K.

How many benchmarks do GLM-5.1 and GLM-5.3-Flash share?

28 benchmarks have published results for both models. GLM-5.1 has 41 scored results on Noometry and GLM-5.3-Flash has 40.

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