Model comparison
GLM-5.1 vs GPT-6 Astra
GPT-6 Astra is the stronger model overall, scoring 70.3 to 47.6 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.
Last verified . 30 shared benchmarks.
Summary
- They share 30 benchmarks with published results for both. GLM-5.1 scores higher in 2 categories and GPT-6 Astra in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Astra leads 85.1 to 38.2.
- 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.
Side by side
| GLM-5.1 | GPT-6 Astra | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 47.6 | 70.3 |
| Released | 2026-04-07 | 2026-09-03 |
| Weights | Open | Proprietary |
| Context window | 200K | 1.05M |
| Max output | 131K | 128K |
| Input $ / M tokens | $1.40 | $10 |
| Output $ / M tokens | $4.40 | $50 |
| Results tracked | 41 | 51 |
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Category by category
Coding GPT-6 Astra leads
GLM-5.1: 48.5 (#52), GPT-6 Astra: 70.5 (#3)
| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena WebDev | 1509 | 1792 |
| SciCode | 43.8% | 56.5% |
| WeirdML | 57.1% | 93.6% |
| LMArena Coding | 1486 | 1488 |
| ALE-Bench | 887.1 | 2,951 |
| SWE-bench Verified | 74.2% | — |
| DeepSWE | — | 74.1% |
| FrontierCode | — | 53.3% |
| FrontierSWE | — | 65.5% |
| MirrorCode | — | 46.7% |
Agentic & Tool Use GPT-6 Astra leads
GLM-5.1: 24.8 (#106), GPT-6 Astra: 52.3 (#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% | — |
Reasoning GPT-6 Astra leads
GLM-5.1: 38.2 (#57), 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 | 1464 |
| Epoch Capabilities Index | 149.86 | 166.6 |
| 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 GPT-6 Astra leads
GLM-5.1: 49.0 (#48), GPT-6 Astra: 93.4 (#1)
| 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 | 1472 | 1463 |
| 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 GPT-6 Astra leads
GLM-5.1: 55.0 (#45), 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 | 1477 | 1486 |
| Humanity's Last Exam | — | 54.8% |
| Vectara Hallucination Rate | — | 8.7% |
Multimodal Not comparable
GLM-5.1: —, GPT-6 Astra: 55.1 (#3)
| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Vision | — | 1280 |
| Blueprint-Bench 2 | — | 49.7% |
| Furniture Assembly | — | 80% |
| LMArena Document | — | 1468 |
Multilingual GLM-5.1 leads
GLM-5.1: 55.2 (#34), GPT-6 Astra: 54.0 (#53)
| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Non-English | 1448 | 1431 |
| LMArena Chinese | 1516 | 1495 |
| LMArena French | 1478 | 1467 |
| LMArena Russian | 1453 | 1434 |
| LMArena Spanish | 1467 | 1412 |
| LMArena German | 1466 | — |
| LMArena Japanese | 1436 | — |
| LMArena Korean | 1423 | — |
Instruction Following Too close to call
GLM-5.1: 76.5 (#41), GPT-6 Astra: 76.6 (#37)
| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Instruction Following | 1451 | 1454 |
Long Context Too close to call
GLM-5.1: 44.9 (#51), GPT-6 Astra: 44.7 (#57)
| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Longer Query | 1467 | 1460 |
Writing & Preference GPT-6 Astra leads
GLM-5.1: 67.2 (#29), GPT-6 Astra: 75.7 (#7)
| Benchmark | GLM-5.1 | GPT-6 Astra |
|---|---|---|
| LMArena Text | 1462 | 1443 |
| LMArena Creative Writing | 1454 | 1423 |
| EQ-Bench Creative Writing | 1592 | 2173 |
| LMArena Multi-Turn | 1473 | 1457 |
Frequently asked questions
Is GLM-5.1 better than GPT-6 Astra?
GPT-6 Astra is the stronger model overall, scoring 70.3 to 47.6 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: 70.5 versus 48.5 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?
30 benchmarks have published results for both models. GLM-5.1 has 41 scored results on Noometry and GPT-6 Astra has 51.