Noometry

Model comparison

Claude Sonnet 5.5 vs GLM-4.5

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 42.0 on the Noometry Index. GLM-4.5 costs 4.0× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Last verified . 13 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

GLM-4.5 Z.ai (Zhipu)

42.0

Rank #122 Confirmed

Summary

  • They share 13 benchmarks with published results for both. Claude Sonnet 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 Sonnet 5.5 leads 87.9 to 39.0.
  • GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Claude Sonnet 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 Sonnet 5.5GLM-4.5
ProviderAnthropicZ.ai (Zhipu)
Noometry Index61.942.0
Released2026-09-282025-07-27
WeightsProprietaryOpen
Context window1M131K
Max output128K98K
Input $ / M tokens$2$0.60
Output $ / M tokens$10$2.20
Results tracked3227

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), GLM-4.5: 41.4 (#125)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Coding15131434
ALE-Bench1,819344.82
FrontierCode52.1%—
SWE-bench Verified (bash only)—54.2%
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
WeirdML—40.6%
AlgoTune—1.52

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), GLM-4.5: —

BenchmarkClaude Sonnet 5.5GLM-4.5
APEX-Agents75.5%—

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), GLM-4.5: 28.6 (#100)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Hard Prompts14951429
Kagi LLM Benchmark—57.9%
NYT Connections (extended)80.5%—
CritPt31.4%—
Mystery Game Puzzles65%—
Epoch Capabilities Index165.03—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), GLM-4.5: 39.0 (#116)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Math15101427
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), GLM-4.5: 35.9 (#179)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Expert15401433
GPQA Diamond95.6%—
Humanity's Last Exam—8.3%
SimpleQA Verified46.5%—
Confabulations—11.3%

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), GLM-4.5: —

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), GLM-4.5: 52.8 (#77)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Non-English14521417
LMArena Chinese15221465
LMArena Russian14511414
LMArena French—1418
LMArena German—1407
LMArena Japanese—1415
LMArena Korean—1380
LMArena Spanish—1454

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), GLM-4.5: 74.1 (#104)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Instruction Following14951404

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), GLM-4.5: 38.2 (#201)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Longer Query14981412
Fiction.LiveBench—58.3%

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), GLM-4.5: 57.5 (#127)

BenchmarkClaude Sonnet 5.5GLM-4.5
LMArena Text14711430
LMArena Creative Writing14651395
LMArena Multi-Turn14741415
Short-Story Creative Writing—73.4%
EQ-Bench Creative Writing—1343

Frequently asked questions

Is Claude Sonnet 5.5 better than GLM-4.5?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 42.0 on the Noometry Index. GLM-4.5 costs 4.0× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 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 Sonnet 5.5 lists at $2 and $10.

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

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

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

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

13 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GLM-4.5 has 27.

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