Model comparison
GLM-4.5 vs GPT-5.5 Instant
GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 41.4 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GLM-4.5 scores higher in 3 categories and GPT-5.5 Instant in 5 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 35.5.
- GLM-4.5 has downloadable open weights; the other is API-only.
Side by side
| GLM-4.5 | GPT-5.5 Instant | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 41.4 | 42.5 |
| Released | 2025-07-27 | 2026-05-05 |
| Weights | Open | Proprietary |
| Context window | 131K | — |
| Max output | 98K | — |
| Input $ / M tokens | $0.60 | — |
| Output $ / M tokens | $2.20 | — |
| Results tracked | 27 | 27 |
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Category by category
Coding GPT-5.5 Instant leads
GLM-4.5: 41.1 (#121), GPT-5.5 Instant: 43.7 (#73)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Coding | 1434 | 1433 |
| SWE-bench Verified (bash only) | 54.2% | — |
| SciCode | — | 48.6% |
| WeirdML | 40.6% | — |
| ALE-Bench | 344.82 | — |
| AlgoTune | 1.52 | — |
Reasoning GLM-4.5 leads
GLM-4.5: 27.7 (#99), GPT-5.5 Instant: 24.2 (#149)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1430 | 1426 |
| Kagi LLM Benchmark | 57.9% | — |
| CritPt | — | 0% |
| Chess Puzzles | — | 12% |
| Epoch Capabilities Index | — | 142.48 |
Math GLM-4.5 leads
GLM-4.5: 36.3 (#119), GPT-5.5 Instant: 26.1 (#241)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Math | 1427 | 1420 |
| FrontierMath (Tiers 1-3) | — | 26.3% |
| FrontierMath Tier 4 | — | 2.4% |
| OTIS Mock AIME 2024-2025 | — | 68.1% |
Knowledge GPT-5.5 Instant leads
GLM-4.5: 35.5 (#172), GPT-5.5 Instant: 48.9 (#68)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Expert | 1433 | 1409 |
| GPQA Diamond | — | 82.5% |
| Humanity's Last Exam | 8.3% | — |
| Confabulations | 11.3% | — |
Multimodal Not comparable
GLM-4.5: —, GPT-5.5 Instant: 39.3 (#48)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Vision | — | 1250 |
| LMArena Document | — | 1403 |
Multilingual Too close to call
GLM-4.5: 53.0 (#74), GPT-5.5 Instant: 53.0 (#76)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Non-English | 1417 | 1417 |
| LMArena Chinese | 1465 | 1457 |
| LMArena French | 1423 | 1428 |
| LMArena German | 1406 | 1410 |
| LMArena Japanese | 1416 | 1408 |
| LMArena Korean | 1382 | 1393 |
| LMArena Russian | 1414 | 1430 |
| LMArena Spanish | 1454 | 1430 |
Instruction Following Too close to call
GLM-4.5: 74.3 (#100), GPT-5.5 Instant: 74.4 (#94)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1405 | 1407 |
Long Context GPT-5.5 Instant leads
GLM-4.5: 38.2 (#196), GPT-5.5 Instant: 43.4 (#92)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Longer Query | 1413 | 1422 |
| Fiction.LiveBench | 58.3% | — |
Writing & Preference GPT-5.5 Instant leads
GLM-4.5: 57.7 (#121), GPT-5.5 Instant: 62.0 (#81)
| Benchmark | GLM-4.5 | GPT-5.5 Instant |
|---|---|---|
| LMArena Text | 1430 | 1419 |
| LMArena Creative Writing | 1395 | 1420 |
| LMArena Multi-Turn | 1415 | 1434 |
| Short-Story Creative Writing | 73.4% | — |
| EQ-Bench Creative Writing | 1343 | — |
Frequently asked questions
Is GLM-4.5 better than GPT-5.5 Instant?
GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 41.4 on the Noometry Index.
Is GLM-4.5 or GPT-5.5 Instant better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 41.1 in the Noometry coding category.
How many benchmarks do GLM-4.5 and GPT-5.5 Instant share?
17 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and GPT-5.5 Instant has 27.