Noometry

Model comparison

Claude Sonnet 5.5 vs GLM-4.6

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 41.4 on the Noometry Index. GLM-4.6 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 . 16 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

GLM-4.6 Z.ai (Zhipu)

41.4

Rank #135 Confirmed

Summary

  • They share 16 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 9 categories and GLM-4.6 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 39.1.
  • The biggest single-benchmark swing is CritPt: 31.4% for Claude Sonnet 5.5 and 1.1% for GLM-4.6.
  • GLM-4.6 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 205K.
  • GLM-4.6 has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5.5GLM-4.6
ProviderAnthropicZ.ai (Zhipu)
Noometry Index61.941.4
Released2026-09-282025-09-30
WeightsProprietaryOpen
Context window1M205K
Max output128K131K
Input $ / M tokens$2$0.60
Output $ / M tokens$10$2.20
Results tracked3229

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), GLM-4.6: 40.1 (#148)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena WebDev17741340
SciCode61%38.4%
LMArena Coding15131449
ALE-Bench1,819340.82
FrontierCode52.1%—
SWE-bench Verified (bash only)—55.4%
CursorBench55.5%—
FrontierSWE61.9%—

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), GLM-4.6: 32.3 (#66)

BenchmarkClaude Sonnet 5.5GLM-4.6
Terminal-Bench—24.5%
APEX-Agents75.5%—
Berkeley Function Calling Leaderboard—72.4%

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), GLM-4.6: 23.7 (#172)

BenchmarkClaude Sonnet 5.5GLM-4.6
CritPt31.4%1.1%
LMArena Hard Prompts14951440
Kagi LLM Benchmark—47.4%
NYT Connections (extended)80.5%—
Mystery Game Puzzles65%—
Epoch Capabilities Index165.03—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), GLM-4.6: 39.1 (#111)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Math15101432
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath (Feb 2025 set)—3.8%
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—2.1%

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), GLM-4.6: 40.2 (#124)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Expert15401431
GPQA Diamond95.6%—
SimpleQA Verified46.5%—
Vectara Hallucination Rate—9.5%

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), GLM-4.6: —

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), GLM-4.6: 53.5 (#66)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Non-English14521426
LMArena Chinese15221499
LMArena Russian14511419
LMArena French—1459
LMArena German—1447
LMArena Japanese—1393
LMArena Korean—1400
LMArena Spanish—1436

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), GLM-4.6: 74.3 (#98)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Instruction Following14951410

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), GLM-4.6: 43.4 (#94)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Longer Query14981422

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), GLM-4.6: 61.1 (#90)

BenchmarkClaude Sonnet 5.5GLM-4.6
LMArena Text14711440
LMArena Creative Writing14651411
LMArena Multi-Turn14741427
EQ-Bench Creative Writing—1411

Frequently asked questions

Is Claude Sonnet 5.5 better than GLM-4.6?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 41.4 on the Noometry Index. GLM-4.6 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-4.6?

GLM-4.6 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-4.6 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 205K.

How many benchmarks do Claude Sonnet 5.5 and GLM-4.6 share?

16 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GLM-4.6 has 29.

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