Noometry

Model comparison

Gemini 3.8 Flash vs GLM-4.5

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 42.0 on the Noometry Index. GLM-4.5 costs 1.5× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.

Last verified . 21 shared benchmarks.

Gemini 3.8 Flash Google

61.8

Rank #11 Confirmed

GLM-4.5 Z.ai (Zhipu)

42.0

Rank #122 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Gemini 3.8 Flash scores higher in 8 categories and GLM-4.5 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.8 Flash leads 76.9 to 28.6.
  • The biggest single-benchmark swing is WeirdML: 84.8% for Gemini 3.8 Flash and 40.6% for GLM-4.5.
  • GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $0.75 / $3.75 for Gemini 3.8 Flash.
  • Gemini 3.8 Flash accepts more context: 1.05M tokens versus 131K.
  • GLM-4.5 has downloadable open weights; the other is API-only.

Side by side

Gemini 3.8 FlashGLM-4.5
ProviderGoogleZ.ai (Zhipu)
Noometry Index61.842.0
Released2026-09-022025-07-27
WeightsProprietaryOpen
Context window1.05M131K
Max output66K98K
Input $ / M tokens$0.75$0.60
Output $ / M tokens$3.75$2.20
Results tracked5027

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Category by category

Coding Gemini 3.8 Flash leads

Gemini 3.8 Flash: 59.2 (#15), GLM-4.5: 41.4 (#125)

BenchmarkGemini 3.8 FlashGLM-4.5
WeirdML84.8%40.6%
LMArena Coding15101434
ALE-Bench1,270344.82
DeepSWE73.8%—
FrontierCode41.2%—
SWE-bench Verified (bash only)—54.2%
CursorBench39.6%—
LMArena WebDev1584—
FrontierSWE19.6%—
SciCode56.6%—
AlgoTune—1.52

Agentic & Tool Use Not comparable

Gemini 3.8 Flash: 41.8 (#21), GLM-4.5: —

BenchmarkGemini 3.8 FlashGLM-4.5
APEX-Agents64.3%—
Remote Labor Index5.8%—
GDP.pdf23.4%—
Vending-Bench 25,094—

Reasoning Gemini 3.8 Flash leads

Gemini 3.8 Flash: 76.9 (#5), GLM-4.5: 28.6 (#100)

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Hard Prompts15081429
ARC-AGI-289.2%—
Kagi LLM Benchmark—57.9%
NYT Connections (extended)97.4%—
ARC-AGI-198.5%—
CritPt18.3%—
Chess Puzzles61%—
Mystery Game Puzzles47%—
DTBench95.7%—
LMCA52.9%—
Surface Evolver Bench76.9%—
Epoch Capabilities Index156.71—

Math Gemini 3.8 Flash leads

Gemini 3.8 Flash: 65.3 (#28), GLM-4.5: 39.0 (#116)

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Math15281427
FrontierMath (Tiers 1-3)68.4%—
FrontierMath Tier 422%—
OTIS Mock AIME 2024-202598.9%—
ProofBench48%—

Knowledge Gemini 3.8 Flash leads

Gemini 3.8 Flash: 74.8 (#2), GLM-4.5: 35.9 (#179)

BenchmarkGemini 3.8 FlashGLM-4.5
Humanity's Last Exam44.5%8.3%
LMArena Expert15241433
GPQA Diamond95.4%—
SimpleQA Verified69.7%—
Confabulations—11.3%

Multimodal Not comparable

Gemini 3.8 Flash: 40.7 (#45), GLM-4.5: —

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Vision1314—
Blueprint-Bench 238.6%—
Furniture Assembly31.7%—

Multilingual Gemini 3.8 Flash leads

Gemini 3.8 Flash: 58.0 (#5), GLM-4.5: 52.8 (#77)

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Non-English14911417
LMArena Chinese15541465
LMArena French14981418
LMArena German14931407
LMArena Japanese15021415
LMArena Korean14591380
LMArena Russian15151414
LMArena Spanish14851454

Instruction Following Gemini 3.8 Flash leads

Gemini 3.8 Flash: 78.0 (#13), GLM-4.5: 74.1 (#104)

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Instruction Following14901404

Long Context Gemini 3.8 Flash leads

Gemini 3.8 Flash: 46.3 (#24), GLM-4.5: 38.2 (#201)

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Longer Query15081412
Fiction.LiveBench—58.3%

Writing & Preference Gemini 3.8 Flash leads

Gemini 3.8 Flash: 72.2 (#15), GLM-4.5: 57.5 (#127)

BenchmarkGemini 3.8 FlashGLM-4.5
LMArena Text14991430
LMArena Creative Writing14921395
EQ-Bench Creative Writing17481343
LMArena Multi-Turn15011415
Short-Story Creative Writing—73.4%

Frequently asked questions

Is Gemini 3.8 Flash better than GLM-4.5?

Gemini 3.8 Flash is the stronger model overall, scoring 61.8 to 42.0 on the Noometry Index. GLM-4.5 costs 1.5× less per token, which makes it the better buy when Gemini 3.8 Flash's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.8 Flash or GLM-4.5?

GLM-4.5 is cheaper. It lists at $0.60 per million input tokens and $2.20 per million output tokens; Gemini 3.8 Flash lists at $0.75 and $3.75.

Is Gemini 3.8 Flash or GLM-4.5 better for coding?

Gemini 3.8 Flash scores higher on coding benchmarks: 59.2 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.8 Flash does, with 1.05M tokens against 131K.

How many benchmarks do Gemini 3.8 Flash and GLM-4.5 share?

21 benchmarks have published results for both models. Gemini 3.8 Flash has 50 scored results on Noometry and GLM-4.5 has 27.

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