# GLM-5.1 vs GPT-6 Astra

> GPT-6 Astra is the stronger model overall, scoring 70.8 to 47.8 on the Noometry Index. GLM-5.1 costs 9.3× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/glm-5-1-vs-gpt-6-astra
- Last updated: 2026-10-12
- Shared benchmarks: 33

## Summary

- They share 33 benchmarks with published results for both. GLM-5.1 scores higher in 3 categories and GPT-6 Astra in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 39.1.
- The biggest single-benchmark swing is ProofBench: 22.2% for GLM-5.1 and 99% for GPT-6 Astra.
- GLM-5.1 is cheaper at $1.40 / $4.40 per million input/output tokens, against $10 / $50 for GPT-6 Astra.
- GPT-6 Astra accepts more context: 1.05M tokens versus 200K.
- GLM-5.1 has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 47.8 | 70.8 |
| Rank | 59 | 1 |
| Context | 200K | 1.05M |
| Input $/M | $1.40 | $10 |
| Output $/M | $4.40 | $50 |
| Weights | Open | Proprietary |

## Coding

- GLM-5.1: 48.7 (#55)
- GPT-6 Astra: 73.7 (#2)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena WebDev | 1508 | 1786 |
| SciCode | 43.8% | 56.5% |
| WeirdML | 57.1% | 93.6% |
| LMArena Coding | 1485 | 1487 |
| ALE-Bench | 887.1 | 2,951 |
| SWE-bench Verified | 74.2% | — |
| DeepSWE | — | 74.1% |
| FrontierCode | — | 53.3% |
| FrontierSWE | — | 65.5% |
| GSO | — | 79.4% |
| MirrorCode | — | 46.7% |

## Agentic & Tool Use

- GLM-5.1: 24.9 (#113)
- GPT-6 Astra: 52.9 (#3)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| APEX-Agents | 40.9% | 64.7% |
| Vending-Bench 2 | 5,634 | 15,515 |
| Remote Labor Index | — | 20.8% |
| BALROG | — | 68.3% |
| ExploitBench | 18.1% | — |
| GBAEval | 0% | — |
| GDP.pdf | — | 34.2% |

## Reasoning

- GLM-5.1: 39.1 (#60)
- GPT-6 Astra: 85.1 (#1)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| NYT Connections (extended) | 77.7% | 98.1% |
| CritPt | 4.6% | 31.7% |
| Chess Puzzles | 19% | 72% |
| LMArena Hard Prompts | 1472 | 1462 |
| Epoch Capabilities Index | 149.84 | 166.45 |
| ARC-AGI-2 | — | 95% |
| SimpleBench | 55.1% | — |
| ARC-AGI-1 | — | 98.5% |
| Thematic Generalization | 69.8% | — |
| EBR-Bench | — | 76.2% |
| Mystery Game Puzzles | — | 84% |
| DTBench | — | 97.3% |
| LMCA | — | 64.4% |
| Bench to the Future 3 | — | 0.14 |

## Math

- GLM-5.1: 49.7 (#60)
- GPT-6 Astra: 93.5 (#2)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| FrontierMath (Tiers 1-3) | 36.8% | 93.7% |
| OTIS Mock AIME 2024-2025 | 93.3% | 100% |
| ProofBench | 22.2% | 99% |
| LMArena Math | 1473 | 1465 |
| FrontierMath Tier 4 | — | 97.6% |
| MathArena Final-Answer Competitions | 67.1% | — |
| FrontierMath (Feb 2025 set) | 33.4% | — |
| FrontierMath Erdős | — | 2.9% |
| FrontierMath Tier 4 (v1) | 12.5% | — |

## Knowledge

- GLM-5.1: 54.9 (#50)
- GPT-6 Astra: 75.3 (#1)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| GPQA Diamond | 89.9% | 95.8% |
| SimpleQA Verified | 34% | 75.6% |
| LMArena Expert | 1476 | 1483 |
| Humanity's Last Exam | — | 54.8% |
| Vectara Hallucination Rate | — | 8.7% |

## Multimodal

- GLM-5.1: —
- GPT-6 Astra: 55.0 (#3)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Vision | — | 1281 |
| Blueprint-Bench 2 | — | 49.7% |
| Furniture Assembly | — | 80% |
| LMArena Document | — | 1468 |

## Multilingual

- GLM-5.1: 55.0 (#36)
- GPT-6 Astra: 53.7 (#61)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Non-English | 1447 | 1430 |
| LMArena Chinese | 1515 | 1484 |
| LMArena French | 1474 | 1456 |
| LMArena German | 1465 | 1440 |
| LMArena Japanese | 1434 | 1379 |
| LMArena Korean | 1418 | 1426 |
| LMArena Russian | 1454 | 1436 |
| LMArena Spanish | 1469 | 1407 |

## Instruction Following

- GLM-5.1: 76.3 (#42)
- GPT-6 Astra: 76.3 (#44)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Instruction Following | 1451 | 1450 |

## Long Context

- GLM-5.1: 44.9 (#53)
- GPT-6 Astra: 44.5 (#62)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Longer Query | 1466 | 1456 |

## Writing & Preference

- GLM-5.1: 66.9 (#31)
- GPT-6 Astra: 75.3 (#7)

| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Text | 1461 | 1441 |
| LMArena Creative Writing | 1453 | 1418 |
| EQ-Bench Creative Writing | 1592 | 2173 |
| LMArena Multi-Turn | 1472 | 1448 |

## FAQ

### Is GLM-5.1 better than GPT-6 Astra?

GPT-6 Astra is the stronger model overall, scoring 70.8 to 47.8 on the Noometry Index. GLM-5.1 costs 9.3× less per token, which makes it the better buy when GPT-6 Astra's lead doesn't matter for your workload.

### Which is cheaper, GLM-5.1 or GPT-6 Astra?

GLM-5.1 is cheaper. It lists at $1.40 per million input tokens and $4.40 per million output tokens; GPT-6 Astra lists at $10 and $50.

### Is GLM-5.1 or GPT-6 Astra better for coding?

GPT-6 Astra scores higher on coding benchmarks: 73.7 versus 48.7 in the Noometry coding category.

### Which has the bigger context window?

GPT-6 Astra does, with 1.05M tokens against 200K.

### How many benchmarks do GLM-5.1 and GPT-6 Astra share?

33 benchmarks have published results for both models. GLM-5.1 has 41 scored results on Noometry and GPT-6 Astra has 56.