Model comparison
GLM-4.5 vs o3-mini
GLM-4.5 is the stronger model overall, scoring 42.0 to 36.7 on the Noometry Index.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. GLM-4.5 scores higher in 6 categories and o3-mini in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GLM-4.5 leads 28.6 to 16.3.
- The biggest single-benchmark swing is Short-Story Creative Writing: 73.4% for GLM-4.5 and 61.7% for o3-mini.
- GLM-4.5 is cheaper at $0.60 / $2.20 per million input/output tokens, against $1.10 / $4.40 for o3-mini.
- o3-mini accepts more context: 200K tokens versus 131K.
- GLM-4.5 has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5 | o3-mini | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 42.0 | 36.7 |
| Released | 2025-07-27 | 2024-12-20 |
| Weights | Open | Proprietary |
| Context window | 131K | 200K |
| Max output | 98K | 100K |
| Input $ / M tokens | $0.60 | $1.10 |
| Output $ / M tokens | $2.20 | $4.40 |
| Results tracked | 27 | 51 |
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Category by category
Coding Too close to call
GLM-4.5: 41.4 (#125), o3-mini: 40.8 (#132)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| WeirdML | 40.6% | 43.7% |
| LMArena Coding | 1434 | 1378 |
| SWE-bench Verified (bash only) | 54.2% | — |
| Aider Polyglot | — | 60.4% |
| SciCode | — | 39.8% |
| GSO | — | 1.3% |
| LiveBench Coding | — | 82.7% |
| CadEval | — | 54% |
| ALE-Bench | 344.82 | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Not comparable
GLM-4.5: —, o3-mini: 29.6 (#84)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| Cybench | — | 22.5% |
Reasoning GLM-4.5 leads
GLM-4.5: 28.6 (#100), o3-mini: 16.3 (#305)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| LMArena Hard Prompts | 1429 | 1366 |
| ARC-AGI-2 | — | 3% |
| SimpleBench | — | 22.8% |
| Kagi LLM Benchmark | 57.9% | — |
| ARC-AGI-1 | — | 34.5% |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 17% |
| LiveBench Reasoning | — | 89.6% |
| Mystery Game Puzzles | — | 7% |
| DTBench | — | 68.8% |
| LiveBench Data Analysis | — | 70.6% |
| LMCA | — | 19% |
| Epoch Capabilities Index | — | 140.34 |
| ForecastBench | — | 59.6 |
| LiveBench | — | 75.9% |
Math GLM-4.5 leads
GLM-4.5: 39.0 (#116), o3-mini: 28.1 (#244)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| LMArena Math | 1427 | 1396 |
| FrontierMath (Tiers 1-3) | — | 18.6% |
| FrontierMath Tier 4 | — | 0% |
| OTIS Mock AIME 2024-2025 | — | 76.9% |
| LiveBench Math | — | 77.3% |
| MATH Level 5 | — | 96.5% |
| FrontierMath (Feb 2025 set) | — | 12.4% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge o3-mini leads
GLM-4.5: 35.9 (#179), o3-mini: 38.3 (#146)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| Confabulations | 11.3% | 17.9% |
| LMArena Expert | 1433 | 1364 |
| GPQA Diamond | — | 77% |
| Humanity's Last Exam | 8.3% | — |
| SimpleQA Verified | — | 15.3% |
Multilingual GLM-4.5 leads
GLM-4.5: 52.8 (#77), o3-mini: 45.7 (#164)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| LMArena Non-English | 1417 | 1319 |
| LMArena Chinese | 1465 | 1379 |
| LMArena French | 1418 | 1334 |
| LMArena German | 1407 | 1303 |
| LMArena Japanese | 1415 | 1286 |
| LMArena Korean | 1380 | 1314 |
| LMArena Russian | 1414 | 1304 |
| LMArena Spanish | 1454 | 1321 |
Instruction Following o3-mini leads
GLM-4.5: 74.1 (#104), o3-mini: 75.1 (#72)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| LMArena Instruction Following | 1404 | 1337 |
| LiveBench Instruction Following | — | 84.4% |
Long Context GLM-4.5 leads
GLM-4.5: 38.2 (#201), o3-mini: 33.8 (#256)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| Fiction.LiveBench | 58.3% | 50% |
| LMArena Longer Query | 1412 | 1343 |
Writing & Preference GLM-4.5 leads
GLM-4.5: 57.5 (#127), o3-mini: 50.3 (#182)
| Benchmark | GLM-4.5 | o3-mini |
|---|---|---|
| LMArena Text | 1430 | 1337 |
| LMArena Creative Writing | 1395 | 1286 |
| Short-Story Creative Writing | 73.4% | 61.7% |
| LMArena Multi-Turn | 1415 | 1320 |
| EQ-Bench Creative Writing | 1343 | — |
| LiveBench Language | — | 50.7% |
Frequently asked questions
Is GLM-4.5 better than o3-mini?
GLM-4.5 is the stronger model overall, scoring 42.0 to 36.7 on the Noometry Index.
Which is cheaper, GLM-4.5 or o3-mini?
GLM-4.5 is cheaper. It lists at $0.60 per million input tokens and $2.20 per million output tokens; o3-mini lists at $1.10 and $4.40.
Is GLM-4.5 or o3-mini better for coding?
They score almost the same on coding (41.4 vs 40.8); test both on your own repository before choosing.
Which has the bigger context window?
o3-mini does, with 200K tokens against 131K.
How many benchmarks do GLM-4.5 and o3-mini share?
21 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and o3-mini has 51.