Model comparison

Claude Sonnet 5.5 vs GLM-5.3

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 54.6 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 October 10, 2026. 14 shared benchmarks.

Claude Sonnet 5.5 Anthropic

60.5

Rank #10 Confirmed

GLM-5.3 Z.ai (Zhipu)

54.6

Rank #25 Confirmed

Summary

They share 14 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 5 categories and GLM-5.3 in 0 categories; 5 gaps are clear of the uncertainty.
The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 62.1.
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 5.5 and GLM-5.3 specifications
	Claude Sonnet 5.5	GLM-5.3
Provider	Anthropic	Z.ai (Zhipu)
Noometry Index	60.5	54.6
Released	2026-09-28	2026-08-14
Weights	Proprietary	Open
Context window	1M	1M
Max output	128K	131K
Input $ / M tokens	$2	$1.40
Output $ / M tokens	$10	$4.40
Results tracked	16	41

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 65.5 (#6), GLM-5.3: 59.0 (#12)

Coding benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
FrontierCode	52.1%	40.1%
LMArena WebDev	1699	1623
FrontierSWE	61.9%	30.2%
SciCode	61%	59%
ALE-Bench	1,819	1,317
DeepSWE	—	69%
CursorBench	55.5%	—
WeirdML	—	75.4%
LMArena Coding	—	1499

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 44.9 (#14), GLM-5.3: 36.3 (#34)

Agentic & Tool Use benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
APEX-Agents	75.5%	56.6%
Vending-Bench 2	—	8,164

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 52.4 (#29), GLM-5.3: 45.2 (#42)

Reasoning benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
CritPt	31.4%	19.1%
Mystery Game Puzzles	65%	33%
NYT Connections (extended)	—	74.2%
Chess Puzzles	—	21%
LMArena Hard Prompts	—	1491
DTBench	—	87.7%
LMCA	—	55.5%
Bench to the Future 3	—	0.15
Epoch Capabilities Index	—	155.56

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 88.7 (#4), GLM-5.3: 62.1 (#27)

Math benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
FrontierMath (Tiers 1-3)	88.8%	68.8%
FrontierMath Tier 4	80.5%	29.3%
OTIS Mock AIME 2024-2025	100%	91.1%
ProofBench	100%	49%
LMArena Math	—	1493

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#11), GLM-5.3: 58.3 (#34)

Knowledge benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
GPQA Diamond	95.6%	90.9%
SimpleQA Verified	46.5%	41%
LMArena Expert	—	1512

Multimodal Not comparable

Claude Sonnet 5.5: 53.2 (#5), GLM-5.3: —

Multimodal benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
Furniture Assembly	75%	—

Multilingual Not comparable

Claude Sonnet 5.5: —, GLM-5.3: 55.9 (#27)

Multilingual benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
LMArena Non-English	—	1457
LMArena Chinese	—	1523
LMArena French	—	1499
LMArena German	—	1505
LMArena Japanese	—	1438
LMArena Korean	—	1478
LMArena Russian	—	1460
LMArena Spanish	—	1444

Instruction Following Not comparable

Claude Sonnet 5.5: —, GLM-5.3: 77.8 (#15)

Instruction Following benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
LMArena Instruction Following	—	1481

Long Context Not comparable

Claude Sonnet 5.5: —, GLM-5.3: 45.5 (#32)

Long Context benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
LMArena Longer Query	—	1485

Writing & Preference Not comparable

Claude Sonnet 5.5: —, GLM-5.3: 75.9 (#6)

Writing & Preference benchmarks
Benchmark	Claude Sonnet 5.5	GLM-5.3
LMArena Text	—	1473
LMArena Creative Writing	—	1459
EQ-Bench Creative Writing	—	2075
LMArena Multi-Turn	—	1473

Frequently asked questions

Is Claude Sonnet 5.5 better than GLM-5.3?

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: 65.5 versus 59.0 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?

14 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and GLM-5.3 has 41.