Noometry

Model comparison

Claude Opus 5.5 vs GLM-4.6

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 41.4 on the Noometry Index. GLM-4.6 costs 8.0× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 19 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

GLM-4.6 Z.ai (Zhipu)

41.4

Rank #135 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Claude Opus 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 reasoning, where Claude Opus 5.5 leads 80.2 to 23.7.
  • The biggest single-benchmark swing is CritPt: 31.7% for Claude Opus 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 $4 / $20 for Claude Opus 5.5.
  • Claude Opus 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 Opus 5.5GLM-4.6
ProviderAnthropicZ.ai (Zhipu)
Noometry Index68.641.4
Released2026-09-222025-09-30
WeightsProprietaryOpen
Context window1M205K
Max output128K131K
Input $ / M tokens$4$0.60
Output $ / M tokens$20$2.20
Results tracked4429

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), GLM-4.6: 40.1 (#148)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena WebDev18131340
SciCode66.9%38.4%
LMArena Coding15471449
ALE-Bench2,147340.82
FrontierCode54.6%—
SWE-bench Verified (bash only)—55.4%
CursorBench57.8%—
FrontierSWE62.3%—
MirrorCode77.4%—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), GLM-4.6: 32.3 (#66)

BenchmarkClaude Opus 5.5GLM-4.6
Terminal-Bench—24.5%
APEX-Agents73.5%—
Berkeley Function Calling Leaderboard—72.4%
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), GLM-4.6: 23.7 (#172)

BenchmarkClaude Opus 5.5GLM-4.6
CritPt31.7%1.1%
LMArena Hard Prompts15351440
ARC-AGI-293.3%—
Kagi LLM Benchmark—47.4%
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), GLM-4.6: 39.1 (#111)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Math15061432
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath (Feb 2025 set)—3.8%
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—2.1%

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), GLM-4.6: 40.2 (#124)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Expert15471431
GPQA Diamond90.6%—
SimpleQA Verified72.2%—
Vectara Hallucination Rate—9.5%

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), GLM-4.6: —

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), GLM-4.6: 53.5 (#66)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Non-English15071426
LMArena Chinese15881499
LMArena French15141459
LMArena Russian15201419
LMArena Spanish15071436
LMArena German—1447
LMArena Japanese—1393
LMArena Korean—1400

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), GLM-4.6: 74.3 (#98)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Instruction Following15371410

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), GLM-4.6: 43.4 (#94)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Longer Query15321422

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), GLM-4.6: 61.1 (#90)

BenchmarkClaude Opus 5.5GLM-4.6
LMArena Text15151440
LMArena Creative Writing15331411
EQ-Bench Creative Writing20501411
LMArena Multi-Turn14991427

Frequently asked questions

Is Claude Opus 5.5 better than GLM-4.6?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 41.4 on the Noometry Index. GLM-4.6 costs 8.0× 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-4.6?

GLM-4.6 is cheaper. It lists at $0.60 per million input tokens and $2.20 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or GLM-4.6 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

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

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

19 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and GLM-4.6 has 29.

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