Noometry

Model comparison

Claude Sonnet 5.5 vs GLM-5.3

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 54.8 on the Noometry Index. GLM-5.3 costs 1.9× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Last verified . 29 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

GLM-5.3 Z.ai (Zhipu)

54.8

Rank #26 Confirmed

Summary

  • They share 29 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 7 categories and GLM-5.3 in 2 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 62.3.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 80.5% for Claude Sonnet 5.5 and 29.3% for GLM-5.3.
  • GLM-5.3 is cheaper at $1.40 / $4.40 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • GLM-5.3 has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5.5GLM-5.3
ProviderAnthropicZ.ai (Zhipu)
Noometry Index61.954.8
Released2026-09-282026-08-14
WeightsProprietaryOpen
Context window1M1M
Max output128K131K
Input $ / M tokens$2$1.40
Output $ / M tokens$10$4.40
Results tracked3242

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), GLM-5.3: 59.5 (#14)

BenchmarkClaude Sonnet 5.5GLM-5.3
FrontierCode52.1%40.1%
CursorBench55.5%42.6%
LMArena WebDev17741622
FrontierSWE61.9%30.2%
SciCode61%59%
LMArena Coding15131496
ALE-Bench1,8191,317
DeepSWE—69%
WeirdML—75.4%

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), GLM-5.3: 36.4 (#38)

BenchmarkClaude Sonnet 5.5GLM-5.3
APEX-Agents75.5%56.6%
Vending-Bench 2—8,164

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), GLM-5.3: 46.1 (#46)

BenchmarkClaude Sonnet 5.5GLM-5.3
NYT Connections (extended)80.5%74.2%
CritPt31.4%19.1%
LMArena Hard Prompts14951489
Mystery Game Puzzles65%33%
Epoch Capabilities Index165.03155.61
Chess Puzzles—21%
DTBench—87.7%
LMCA—55.5%
Bench to the Future 3—0.15

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), GLM-5.3: 62.3 (#33)

BenchmarkClaude Sonnet 5.5GLM-5.3
FrontierMath (Tiers 1-3)88.8%68.8%
FrontierMath Tier 480.5%29.3%
OTIS Mock AIME 2024-2025100%91.1%
ProofBench100%49%
LMArena Math15101489
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), GLM-5.3: 58.3 (#37)

BenchmarkClaude Sonnet 5.5GLM-5.3
GPQA Diamond95.6%90.9%
SimpleQA Verified46.5%41%
LMArena Expert15401516

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), GLM-5.3: —

BenchmarkClaude Sonnet 5.5GLM-5.3
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Too close to call

Claude Sonnet 5.5: 55.3 (#30), GLM-5.3: 55.7 (#28)

BenchmarkClaude Sonnet 5.5GLM-5.3
LMArena Non-English14521457
LMArena Chinese15221528
LMArena Russian14511463
LMArena French—1499
LMArena German—1499
LMArena Japanese—1453
LMArena Korean—1472
LMArena Spanish—1460

Instruction Following Too close to call

Claude Sonnet 5.5: 78.3 (#11), GLM-5.3: 77.5 (#23)

BenchmarkClaude Sonnet 5.5GLM-5.3
LMArena Instruction Following14951477

Long Context Too close to call

Claude Sonnet 5.5: 45.9 (#28), GLM-5.3: 45.4 (#41)

BenchmarkClaude Sonnet 5.5GLM-5.3
LMArena Longer Query14981482

Writing & Preference GLM-5.3 leads

Claude Sonnet 5.5: 66.0 (#40), GLM-5.3: 75.7 (#6)

BenchmarkClaude Sonnet 5.5GLM-5.3
LMArena Text14711471
LMArena Creative Writing14651457
LMArena Multi-Turn14741472
EQ-Bench Creative Writing—2075

Frequently asked questions

Is Claude Sonnet 5.5 better than GLM-5.3?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 54.8 on the Noometry Index. GLM-5.3 costs 1.9× 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-5.3?

GLM-5.3 is cheaper. It lists at $1.40 per million input tokens and $4.40 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or GLM-5.3 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 59.5 in the Noometry coding category.

Which has the bigger context window?

Both accept 1M tokens.

How many benchmarks do Claude Sonnet 5.5 and GLM-5.3 share?

29 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GLM-5.3 has 42.

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