Model comparison
GLM-4.5 vs GPT-5 Pro
GPT-5 Pro is the stronger model overall, scoring 46.4 to 42.0 on the Noometry Index. GLM-4.5 costs 41× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.
Last verified . 4 shared benchmarks.
Summary
- They share 4 benchmarks with published results for both. GLM-4.5 scores higher in 0 categories and GPT-5 Pro in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5 Pro leads 56.7 to 35.9.
- The biggest single-benchmark swing is Humanity's Last Exam: 8.3% for GLM-4.5 and 31.6% for GPT-5 Pro.
- GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- GPT-5 Pro accepts more context: 400K tokens versus 131K.
- GLM-4.5 has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5 | GPT-5 Pro | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 42.0 | 46.4 |
| Released | 2025-07-27 | 2025-10-06 |
| Weights | Open | Proprietary |
| Context window | 131K | 400K |
| Max output | 98K | 272K |
| Input $ / M tokens | $0.60 | $15 |
| Output $ / M tokens | $2.20 | $120 |
| Results tracked | 27 | 12 |
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Category by category
Coding GPT-5 Pro leads
GLM-4.5: 41.4 (#125), GPT-5 Pro: 44.0 (#80)
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| WeirdML | 40.6% | 60.4% |
| AlgoTune | 1.52 | 1.31 |
| SWE-bench Verified (bash only) | 54.2% | — |
| LMArena Coding | 1434 | — |
| ALE-Bench | 344.82 | — |
Reasoning GPT-5 Pro leads
GLM-4.5: 28.6 (#100), GPT-5 Pro: 38.9 (#62)
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| Kagi LLM Benchmark | 57.9% | 76.8% |
| ARC-AGI-2 | — | 18.3% |
| SimpleBench | — | 61.6% |
| ARC-AGI-1 | — | 70.2% |
| EnigmaEval | — | 18.8% |
| LMArena Hard Prompts | 1429 | — |
| Epoch Capabilities Index | — | 150.28 |
Math GPT-5 Pro leads
GLM-4.5: 39.0 (#116), GPT-5 Pro: 48.5 (#63)
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 55.8% |
| FrontierMath Tier 4 | — | 19.5% |
| LMArena Math | 1427 | — |
| FrontierMath Tier 4 (v1) | — | 14.6% |
Knowledge GPT-5 Pro leads
GLM-4.5: 35.9 (#179), GPT-5 Pro: 56.7 (#42)
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| Humanity's Last Exam | 8.3% | 31.6% |
| Confabulations | 11.3% | — |
| LMArena Expert | 1433 | — |
Multilingual Not comparable
GLM-4.5: 52.8 (#77), GPT-5 Pro: —
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| LMArena Non-English | 1417 | — |
| LMArena Chinese | 1465 | — |
| LMArena French | 1418 | — |
| LMArena German | 1407 | — |
| LMArena Japanese | 1415 | — |
| LMArena Korean | 1380 | — |
| LMArena Russian | 1414 | — |
| LMArena Spanish | 1454 | — |
Instruction Following Not comparable
GLM-4.5: 74.1 (#104), GPT-5 Pro: —
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| LMArena Instruction Following | 1404 | — |
Long Context Not comparable
GLM-4.5: 38.2 (#201), GPT-5 Pro: —
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| Fiction.LiveBench | 58.3% | — |
| LMArena Longer Query | 1412 | — |
Writing & Preference Not comparable
GLM-4.5: 57.5 (#127), GPT-5 Pro: —
| Benchmark | GLM-4.5 | GPT-5 Pro |
|---|---|---|
| LMArena Text | 1430 | — |
| LMArena Creative Writing | 1395 | — |
| Short-Story Creative Writing | 73.4% | — |
| EQ-Bench Creative Writing | 1343 | — |
| LMArena Multi-Turn | 1415 | — |
Frequently asked questions
Is GLM-4.5 better than GPT-5 Pro?
GPT-5 Pro is the stronger model overall, scoring 46.4 to 42.0 on the Noometry Index. GLM-4.5 costs 41× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.
Which is cheaper, GLM-4.5 or GPT-5 Pro?
GLM-4.5 is cheaper. It lists at $0.60 per million input tokens and $2.20 per million output tokens; GPT-5 Pro lists at $15 and $120.
Is GLM-4.5 or GPT-5 Pro better for coding?
GPT-5 Pro scores higher on coding benchmarks: 44.0 versus 41.4 in the Noometry coding category.
Which has the bigger context window?
GPT-5 Pro does, with 400K tokens against 131K.
How many benchmarks do GLM-4.5 and GPT-5 Pro share?
4 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and GPT-5 Pro has 12.