# Claude Sonnet 5.5 vs GLM-5

> Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 46.1 on the Noometry Index. GLM-5 costs 2.6× 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-5
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and GLM-5 in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 46.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 80% for GLM-5.
- GLM-5 is cheaper at $1 / $3.20 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 205K.
- GLM-5 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 61.9 | 46.1 |
| Rank | 10 | 66 |
| Context | 1M | 205K |
| Input $/M | $2 | $1 |
| Output $/M | $10 | $3.20 |
| Weights | Proprietary | Open |

## Coding

- Claude Sonnet 5.5: 67.3 (#6)
- GLM-5: 49.0 (#52)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| LMArena WebDev | 1774 | 1434 |
| LMArena Coding | 1513 | 1461 |
| ALE-Bench | 1,819 | 765.62 |
| SWE-bench Verified | — | 72.1% |
| FrontierCode | 52.1% | — |
| SWE-bench Verified (bash only) | — | 72.8% |
| CursorBench | 55.5% | — |
| SWE-bench Multilingual | — | 69.7% |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 48.2% |

## Agentic & Tool Use

- Claude Sonnet 5.5: 45.0 (#16)
- GLM-5: 31.1 (#71)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| Terminal-Bench | — | 52.4% |
| APEX-Agents | 75.5% | — |
| τ²-bench Airline | — | 82.5% |
| τ²-bench Banking | — | 9.8% |
| τ²-bench Retail | — | 73.7% |
| τ²-bench Telecom | — | 86.8% |
| Vending-Bench 2 | — | 4,432 |

## Reasoning

- Claude Sonnet 5.5: 54.0 (#28)
- GLM-5: 27.6 (#116)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| NYT Connections (extended) | 80.5% | 74.8% |
| LMArena Hard Prompts | 1495 | 1452 |
| Epoch Capabilities Index | 165.03 | 145.83 |
| ARC-AGI-2 | — | 4.9% |
| SimpleBench | — | 53.2% |
| Kagi LLM Benchmark | — | 75% |
| ARC-AGI-1 | — | 44.7% |
| CritPt | 31.4% | — |
| Chess Puzzles | — | 10% |
| Mystery Game Puzzles | 65% | — |
| ForecastBench | — | 61 |

## Math

- Claude Sonnet 5.5: 87.9 (#6)
- GLM-5: 46.4 (#71)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 80% |
| LMArena Math | 1510 | 1440 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| MathArena Final-Answer Competitions | — | 65.7% |
| ProofBench | 100% | — |
| FrontierMath (Feb 2025 set) | — | 16.4% |
| FrontierMath Erdős | 2.9% | — |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#12)
- GLM-5: 52.3 (#64)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| GPQA Diamond | 95.6% | 87.8% |
| LMArena Expert | 1540 | 1454 |
| SimpleQA Verified | 46.5% | — |
| Vectara Hallucination Rate | — | 10.1% |

## Multimodal

- Claude Sonnet 5.5: 51.5 (#6)
- GLM-5: —

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: 55.3 (#30)
- GLM-5: 53.7 (#58)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| LMArena Non-English | 1452 | 1430 |
| LMArena Chinese | 1522 | 1511 |
| LMArena Russian | 1451 | 1436 |
| LMArena French | — | 1455 |
| LMArena German | — | 1445 |
| LMArena Japanese | — | 1416 |
| LMArena Korean | — | 1423 |
| LMArena Spanish | — | 1454 |

## Instruction Following

- Claude Sonnet 5.5: 78.3 (#11)
- GLM-5: 75.2 (#67)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1428 |

## Long Context

- Claude Sonnet 5.5: 45.9 (#28)
- GLM-5: 44.7 (#60)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| LMArena Longer Query | 1498 | 1446 |
| CL-bench | — | 18.7% |

## Writing & Preference

- Claude Sonnet 5.5: 66.0 (#40)
- GLM-5: 66.0 (#38)

| Benchmark | Claude Sonnet 5.5 | GLM-5 |
|---|---|---|
| LMArena Text | 1471 | 1446 |
| LMArena Creative Writing | 1465 | 1439 |
| LMArena Multi-Turn | 1474 | 1456 |
| EQ-Bench Creative Writing | — | 1601 |

## FAQ

### Is Claude Sonnet 5.5 better than GLM-5?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 46.1 on the Noometry Index. GLM-5 costs 2.6× 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-5?

GLM-5 is cheaper. It lists at $1 per million input tokens and $3.20 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

### Is Claude Sonnet 5.5 or GLM-5 better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 49.0 in the Noometry coding category.

### Which has the bigger context window?

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

### How many benchmarks do Claude Sonnet 5.5 and GLM-5 share?

18 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and GLM-5 has 45.