Noometry

Model comparison

Claude Opus 5.5 vs GLM-5.3

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 54.8 on the Noometry Index. GLM-5.3 costs 3.7× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 35 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

GLM-5.3 Z.ai (Zhipu)

54.8

Rank #26 Confirmed

Summary

  • They share 35 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and GLM-5.3 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 46.1.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 95% for Claude Opus 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 $4 / $20 for Claude Opus 5.5.
  • GLM-5.3 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5GLM-5.3
ProviderAnthropicZ.ai (Zhipu)
Noometry Index68.654.8
Released2026-09-222026-08-14
WeightsProprietaryOpen
Context window1M1M
Max output128K131K
Input $ / M tokens$4$1.40
Output $ / M tokens$20$4.40
Results tracked4442

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), GLM-5.3: 59.5 (#14)

BenchmarkClaude Opus 5.5GLM-5.3
FrontierCode54.6%40.1%
CursorBench57.8%42.6%
LMArena WebDev18131622
FrontierSWE62.3%30.2%
SciCode66.9%59%
LMArena Coding15471496
ALE-Bench2,1471,317
DeepSWE—69%
WeirdML—75.4%
MirrorCode77.4%—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), GLM-5.3: 36.4 (#38)

BenchmarkClaude Opus 5.5GLM-5.3
APEX-Agents73.5%56.6%
Vending-Bench 29,2358,164
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), GLM-5.3: 46.1 (#46)

BenchmarkClaude Opus 5.5GLM-5.3
NYT Connections (extended)88.5%74.2%
CritPt31.7%19.1%
LMArena Hard Prompts15351489
Mystery Game Puzzles71%33%
DTBench98.9%87.7%
LMCA68.2%55.5%
Epoch Capabilities Index167.33155.61
ARC-AGI-293.3%—
ARC-AGI-198.5%—
Chess Puzzles—21%
EBR-Bench71.4%—
Bench to the Future 3—0.15

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), GLM-5.3: 62.3 (#33)

BenchmarkClaude Opus 5.5GLM-5.3
FrontierMath (Tiers 1-3)91.2%68.8%
FrontierMath Tier 495%29.3%
OTIS Mock AIME 2024-2025100%91.1%
ProofBench100%49%
LMArena Math15061489
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), GLM-5.3: 58.3 (#37)

BenchmarkClaude Opus 5.5GLM-5.3
GPQA Diamond90.6%90.9%
SimpleQA Verified72.2%41%
LMArena Expert15471516

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), GLM-5.3: —

BenchmarkClaude Opus 5.5GLM-5.3
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), GLM-5.3: 55.7 (#28)

BenchmarkClaude Opus 5.5GLM-5.3
LMArena Non-English15071457
LMArena Chinese15881528
LMArena French15141499
LMArena Russian15201463
LMArena Spanish15071460
LMArena German—1499
LMArena Japanese—1453
LMArena Korean—1472

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), GLM-5.3: 77.5 (#23)

BenchmarkClaude Opus 5.5GLM-5.3
LMArena Instruction Following15371477

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), GLM-5.3: 45.4 (#41)

BenchmarkClaude Opus 5.5GLM-5.3
LMArena Longer Query15321482

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), GLM-5.3: 75.7 (#6)

BenchmarkClaude Opus 5.5GLM-5.3
LMArena Text15151471
LMArena Creative Writing15331457
EQ-Bench Creative Writing20502075
LMArena Multi-Turn14991472

Frequently asked questions

Is Claude Opus 5.5 better than GLM-5.3?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 54.8 on the Noometry Index. GLM-5.3 costs 3.7× 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-5.3?

GLM-5.3 is cheaper. It lists at $1.40 per million input tokens and $4.40 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

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

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 59.5 in the Noometry coding category.

Which has the bigger context window?

Both accept 1M tokens.

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

35 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and GLM-5.3 has 42.

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