# Claude Sonnet 5.5 vs GLM-4.5

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 41.4 on the Noometry Index. GLM-4.5 costs 4.0× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-glm-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Claude Sonnet 5.5 scores higher in 4 categories and GLM-4.5 in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 88.7 to 36.3.
- GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 131K.
- GLM-4.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 60.5 | 41.4 |
| Rank | 10 | 125 |
| Context | 1M | 131K |
| Input $/M | $2 | $0.60 |
| Output $/M | $10 | $2.20 |
| Weights | Proprietary | Open |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- GLM-4.5: 41.1 (#121)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| ALE-Bench | 1,819 | 344.82 |
| FrontierCode | 52.1% | — |
| SWE-bench Verified (bash only) | — | 54.2% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 40.6% |
| LMArena Coding | — | 1434 |
| AlgoTune | — | 1.52 |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- GLM-4.5: —

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| APEX-Agents | 75.5% | — |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- GLM-4.5: 27.7 (#99)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| Kagi LLM Benchmark | — | 57.9% |
| CritPt | 31.4% | — |
| LMArena Hard Prompts | — | 1430 |
| Mystery Game Puzzles | 65% | — |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- GLM-4.5: 36.3 (#119)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | — | 1427 |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- GLM-4.5: 35.5 (#172)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| Humanity's Last Exam | — | 8.3% |
| SimpleQA Verified | 46.5% | — |
| Confabulations | — | 11.3% |
| LMArena Expert | — | 1433 |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- GLM-4.5: —

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: —
- GLM-4.5: 53.0 (#74)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| LMArena Non-English | — | 1417 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1423 |
| LMArena German | — | 1406 |
| LMArena Japanese | — | 1416 |
| LMArena Korean | — | 1382 |
| LMArena Russian | — | 1414 |
| LMArena Spanish | — | 1454 |

## Instruction Following

- Claude Sonnet 5.5: —
- GLM-4.5: 74.3 (#100)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| LMArena Instruction Following | — | 1405 |

## Long Context

- Claude Sonnet 5.5: —
- GLM-4.5: 38.2 (#196)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| Fiction.LiveBench | — | 58.3% |
| LMArena Longer Query | — | 1413 |

## Writing & Preference

- Claude Sonnet 5.5: —
- GLM-4.5: 57.7 (#121)

| Benchmark | Claude Sonnet 5.5 | GLM-4.5 |
|---|---|---|
| LMArena Text | — | 1430 |
| LMArena Creative Writing | — | 1395 |
| Short-Story Creative Writing | — | 73.4% |
| EQ-Bench Creative Writing | — | 1343 |
| LMArena Multi-Turn | — | 1415 |

## FAQ

### Is Claude Sonnet 5.5 better than GLM-4.5?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 41.4 on the Noometry Index. GLM-4.5 costs 4.0× 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-4.5?

GLM-4.5 is cheaper. It lists at $0.60 per million input tokens and $2.20 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

### Is Claude Sonnet 5.5 or GLM-4.5 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 65.5 versus 41.1 in the Noometry coding category.

### Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 131K.

### How many benchmarks do Claude Sonnet 5.5 and GLM-4.5 share?

1 benchmark has published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and GLM-4.5 has 27.