Noometry

Model comparison

Claude Opus 5.5 vs GLM-4.5

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 41.4 on the Noometry Index. GLM-4.5 costs 8.0× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 12 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

GLM-4.5 Z.ai (Zhipu)

41.4

Rank #125 Confirmed

Summary

  • They share 12 benchmarks with published results for both. Claude Opus 5.5 scores higher in 8 categories and GLM-4.5 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 92.4 to 36.3.
  • GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 131K.
  • GLM-4.5 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5GLM-4.5
ProviderAnthropicZ.ai (Zhipu)
Noometry Index68.541.4
Released2026-09-222025-07-27
WeightsProprietaryOpen
Context window1M131K
Max output128K98K
Input $ / M tokens$4$0.60
Output $ / M tokens$20$2.20
Results tracked3527

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), GLM-4.5: 41.1 (#121)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Coding15451434
FrontierCode54.4%—
SWE-bench Verified (bash only)—54.2%
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
SciCode66.9%—
WeirdML—40.6%
MirrorCode77.4%—
ALE-Bench—344.82
AlgoTune—1.52

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), GLM-4.5: —

BenchmarkClaude Opus 5.5GLM-4.5
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), GLM-4.5: 27.7 (#99)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Hard Prompts15451430
ARC-AGI-292.5%—
Kagi LLM Benchmark—57.9%
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), GLM-4.5: 36.3 (#119)

BenchmarkClaude Opus 5.5GLM-4.5
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
LMArena Math—1427

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.6 (#9), GLM-4.5: 35.5 (#172)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Expert15641433
GPQA Diamond90.6%—
Humanity's Last Exam—8.3%
SimpleQA Verified72.2%—
Confabulations—11.3%

Multimodal Not comparable

Claude Opus 5.5: 56.5 (#2), GLM-4.5: —

BenchmarkClaude Opus 5.5GLM-4.5
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), GLM-4.5: 53.0 (#74)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Non-English15131417
LMArena Chinese15721465
LMArena Russian15321414
LMArena French—1423
LMArena German—1406
LMArena Japanese—1416
LMArena Korean—1382
LMArena Spanish—1454

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), GLM-4.5: 74.3 (#100)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Instruction Following15351405

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), GLM-4.5: 38.2 (#196)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Longer Query15401413
Fiction.LiveBench—58.3%

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), GLM-4.5: 57.7 (#121)

BenchmarkClaude Opus 5.5GLM-4.5
LMArena Text15181430
LMArena Creative Writing15381395
EQ-Bench Creative Writing20501343
LMArena Multi-Turn15201415
Short-Story Creative Writing—73.4%

Frequently asked questions

Is Claude Opus 5.5 better than GLM-4.5?

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 41.4 on the Noometry Index. GLM-4.5 costs 8.0× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 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; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or GLM-4.5 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 41.1 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 131K.

How many benchmarks do Claude Opus 5.5 and GLM-4.5 share?

12 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and GLM-4.5 has 27.

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