# Claude Opus 4.5 vs GLM-5.3-Flash

> Claude Opus 4.5 and GLM-5.3-Flash score almost the same on the Noometry Index (50.5 vs 49.6), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/claude-opus-4-5-vs-glm-5-3-flash
- Last updated: 2026-10-10
- Shared benchmarks: 27

## Summary

- They share 27 benchmarks with published results for both. Claude Opus 4.5 scores higher in 5 categories and GLM-5.3-Flash in 5 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where GLM-5.3-Flash leads 53.1 to 38.5.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 34.4% for Claude Opus 4.5 and 55.8% for GLM-5.3-Flash.
- GLM-5.3-Flash is cheaper at $0.15 / $0.50 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
- GLM-5.3-Flash accepts more context: 1M tokens versus 200K.
- GLM-5.3-Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 50.5 | 49.6 |
| Rank | 39 | 45 |
| Context | 200K | 1M |
| Input $/M | $5 | $0.15 |
| Output $/M | $25 | $0.50 |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 4.5: 55.4 (#21)
- GLM-5.3-Flash: 53.7 (#26)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena WebDev | 1493 | 1614 |
| LMArena Coding | 1504 | 1506 |
| ALE-Bench | 1,025 | 303.55 |
| SWE-bench Verified | 76.7% | — |
| DeepSWE | — | 63.4% |
| FrontierCode | — | 31.8% |
| SWE-bench Verified (bash only) | 76.8% | — |
| SWE-bench Multilingual | 70.7% | — |
| SciCode | — | 51.6% |
| GSO | 26.5% | — |
| WeirdML | 63.7% | — |
| AlgoTune | 1.77 | — |

## Agentic & Tool Use

- Claude Opus 4.5: 47.2 (#11)
- GLM-5.3-Flash: 34.3 (#41)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| Terminal-Bench | 63.1% | — |
| APEX-Agents | — | 52.8% |
| Berkeley Function Calling Leaderboard | 77.5% | — |
| GDPval | 45.5% | — |
| Remote Labor Index | 3.8% | — |
| τ²-bench Airline | 84% | — |
| τ²-bench Banking | 24.7% | — |
| τ²-bench Retail | 79.6% | — |
| τ²-bench Telecom | 92.3% | — |
| Cybench | 82% | — |
| DeepResearch Bench | 54.8% | — |
| OSWorld | 66.3% | — |
| BALROG | 43.5% | — |
| GDP.pdf | — | 14% |
| LMArena Search | 1180 | — |
| METR Time Horizons | 75% | — |
| Vending-Bench 2 | 4,967 | — |

## Reasoning

- Claude Opus 4.5: 42.5 (#43)
- GLM-5.3-Flash: 31.7 (#69)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| Chess Puzzles | 12% | 14% |
| LMArena Hard Prompts | 1476 | 1490 |
| Mystery Game Puzzles | 22% | 8% |
| Epoch Capabilities Index | 150.1 | 151.9 |
| ARC-AGI-2 | 37.6% | — |
| SimpleBench | 62% | — |
| Kagi LLM Benchmark | 80.2% | — |
| NYT Connections (extended) | 52.5% | — |
| ARC-AGI-1 | 80% | — |
| CritPt | — | 15.4% |
| EnigmaEval | 11.9% | — |
| EBR-Bench | 14.3% | — |
| DTBench | 89.9% | — |
| LMCA | 44.5% | — |
| Surface Evolver Bench | — | 52.5% |
| Bench to the Future 3 | — | 0.15 |
| ForecastBench | 60.7 | — |

## Math

- Claude Opus 4.5: 38.5 (#85)
- GLM-5.3-Flash: 53.1 (#38)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 34.4% | 55.8% |
| FrontierMath Tier 4 | 4.9% | 17.1% |
| OTIS Mock AIME 2024-2025 | 86.1% | 93.9% |
| ProofBench | 36% | 21% |
| LMArena Math | 1463 | 1499 |
| FrontierMath (Feb 2025 set) | 20.7% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4.5: 56.4 (#38)
- GLM-5.3-Flash: 58.4 (#33)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| GPQA Diamond | 86% | 90.2% |
| LMArena Expert | 1488 | 1512 |
| Humanity's Last Exam | 25.2% | — |
| SimpleQA Verified | 45.7% | — |
| Vectara Hallucination Rate | 10.9% | — |

## Multimodal

- Claude Opus 4.5: 31.1 (#99)
- GLM-5.3-Flash: 42.6 (#25)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Vision | — | 1304 |
| GeoBench | 75% | — |
| VPCT | 40% | — |
| Furniture Assembly | 28.3% | — |
| LMArena Document | 1462 | — |

## Multilingual

- Claude Opus 4.5: 54.5 (#45)
- GLM-5.3-Flash: 56.2 (#24)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Non-English | 1438 | 1462 |
| LMArena Chinese | 1470 | 1529 |
| LMArena French | 1471 | 1495 |
| LMArena German | 1449 | 1457 |
| LMArena Japanese | 1415 | 1420 |
| LMArena Korean | 1424 | 1443 |
| LMArena Russian | 1448 | 1472 |
| LMArena Spanish | 1455 | 1471 |

## Instruction Following

- Claude Opus 4.5: 77.7 (#20)
- GLM-5.3-Flash: 77.8 (#17)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Instruction Following | 1478 | 1480 |

## Long Context

- Claude Opus 4.5: 46.4 (#21)
- GLM-5.3-Flash: 45.3 (#41)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Longer Query | 1480 | 1479 |
| CL-bench | 21.1% | — |

## Writing & Preference

- Claude Opus 4.5: 68.2 (#28)
- GLM-5.3-Flash: 65.4 (#49)

| Benchmark | Claude Opus 4.5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Text | 1451 | 1471 |
| LMArena Creative Writing | 1445 | 1440 |
| LMArena Multi-Turn | 1466 | 1471 |
| EQ-Bench Creative Writing | 1687 | — |

## FAQ

### Is Claude Opus 4.5 better than GLM-5.3-Flash?

Claude Opus 4.5 and GLM-5.3-Flash score almost the same on the Noometry Index (50.5 vs 49.6), so choose on price, context window or the category you care about most.

### Which is cheaper, Claude Opus 4.5 or GLM-5.3-Flash?

GLM-5.3-Flash is cheaper. It lists at $0.15 per million input tokens and $0.50 per million output tokens; Claude Opus 4.5 lists at $5 and $25.

### Is Claude Opus 4.5 or GLM-5.3-Flash better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 55.4 versus 53.7 in the Noometry coding category.

### Which has the bigger context window?

GLM-5.3-Flash does, with 1M tokens against 200K.

### How many benchmarks do Claude Opus 4.5 and GLM-5.3-Flash share?

27 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and GLM-5.3-Flash has 36.