Noometry

Model comparison

Claude Opus 4.1 vs GLM-4.5

GLM-4.5 is the stronger model overall, scoring 42.0 to 41.0 on the Noometry Index.

Last verified . 23 shared benchmarks.

Claude Opus 4.1 Anthropic

41.0

Rank #142 Confirmed

GLM-4.5 Z.ai (Zhipu)

42.0

Rank #122 Confirmed

Summary

  • They share 23 benchmarks with published results for both. Claude Opus 4.1 scores higher in 6 categories and GLM-4.5 in 2 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where GLM-4.5 leads 39.0 to 22.3.
  • The biggest single-benchmark swing is Short-Story Creative Writing: 84.7% for Claude Opus 4.1 and 73.4% for GLM-4.5.
  • GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
  • Claude Opus 4.1 accepts more context: 200K tokens versus 131K.
  • GLM-4.5 has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.1GLM-4.5
ProviderAnthropicZ.ai (Zhipu)
Noometry Index41.042.0
Released2025-08-052025-07-27
WeightsProprietaryOpen
Context window200K131K
Max output32K98K
Input $ / M tokens$15$0.60
Output $ / M tokens$75$2.20
Results tracked4827

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Category by category

Coding Claude Opus 4.1 leads

Claude Opus 4.1: 44.4 (#73), GLM-4.5: 41.4 (#125)

BenchmarkClaude Opus 4.1GLM-4.5
WeirdML45.9%40.6%
LMArena Coding14791434
ALE-Bench674.77344.82
AlgoTune1.341.52
SWE-bench Verified73.3%—
SWE-bench Verified (bash only)—54.2%
LMArena WebDev1390—

Agentic & Tool Use Not comparable

Claude Opus 4.1: 35.0 (#41), GLM-4.5: —

BenchmarkClaude Opus 4.1GLM-4.5
Terminal-Bench38%—
GDPval43.6%—
Cybench42%—
DeepResearch Bench48.3%—
LMArena Search1148—
METR Time Horizons66.8%—

Reasoning Claude Opus 4.1 leads

Claude Opus 4.1: 32.2 (#76), GLM-4.5: 28.6 (#100)

BenchmarkClaude Opus 4.1GLM-4.5
LMArena Hard Prompts14431429
SimpleBench60%—
Kagi LLM Benchmark—57.9%
Chess Puzzles7%—
EnigmaEval7.2%—
EBR-Bench7.9%—
Mystery Game Puzzles21%—
DTBench80%—
LMCA37.1%—
Epoch Capabilities Index144.12—
ForecastBench62—

Math GLM-4.5 leads

Claude Opus 4.1: 22.3 (#277), GLM-4.5: 39.0 (#116)

BenchmarkClaude Opus 4.1GLM-4.5
LMArena Math14311427
FrontierMath (Tiers 1-3)12.6%—
FrontierMath Tier 42.4%—
OTIS Mock AIME 2024-202568.9%—
FrontierMath (Feb 2025 set)7.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.1 leads

Claude Opus 4.1: 42.0 (#101), GLM-4.5: 35.9 (#179)

BenchmarkClaude Opus 4.1GLM-4.5
Humanity's Last Exam11.5%8.3%
Confabulations17.1%11.3%
LMArena Expert14391433
GPQA Diamond77.3%—
Vectara Hallucination Rate11.8%—

Multimodal Not comparable

Claude Opus 4.1: 26.8 (#119), GLM-4.5: —

BenchmarkClaude Opus 4.1GLM-4.5
VPCT35%—

Multilingual Too close to call

Claude Opus 4.1: 52.0 (#95), GLM-4.5: 52.8 (#77)

BenchmarkClaude Opus 4.1GLM-4.5
LMArena Non-English14051417
LMArena Chinese14271465
LMArena French14311418
LMArena German14131407
LMArena Japanese13781415
LMArena Korean13801380
LMArena Russian14221414
LMArena Spanish14481454

Instruction Following Claude Opus 4.1 leads

Claude Opus 4.1: 75.6 (#58), GLM-4.5: 74.1 (#104)

BenchmarkClaude Opus 4.1GLM-4.5
LMArena Instruction Following14351404

Long Context Claude Opus 4.1 leads

Claude Opus 4.1: 44.5 (#63), GLM-4.5: 38.2 (#201)

BenchmarkClaude Opus 4.1GLM-4.5
LMArena Longer Query14551412
Fiction.LiveBench—58.3%

Writing & Preference Claude Opus 4.1 leads

Claude Opus 4.1: 62.4 (#74), GLM-4.5: 57.5 (#127)

BenchmarkClaude Opus 4.1GLM-4.5
LMArena Text14191430
LMArena Creative Writing14121395
Short-Story Creative Writing84.7%73.4%
LMArena Multi-Turn14441415
EQ-Bench Creative Writing—1343

Frequently asked questions

Is Claude Opus 4.1 better than GLM-4.5?

GLM-4.5 is the stronger model overall, scoring 42.0 to 41.0 on the Noometry Index.

Which is cheaper, Claude Opus 4.1 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 Opus 4.1 lists at $15 and $75.

Is Claude Opus 4.1 or GLM-4.5 better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 41.4 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 4.1 does, with 200K tokens against 131K.

How many benchmarks do Claude Opus 4.1 and GLM-4.5 share?

23 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and GLM-4.5 has 27.

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