Model comparison
GLM-5 vs GPT-5.5 Pro
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 46.1 on the Noometry Index. GLM-5 costs 44× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 9 shared benchmarks.
Summary
- They share 9 benchmarks with published results for both. GLM-5 scores higher in 0 categories and GPT-5.5 Pro in 3 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 27.6.
- The biggest single-benchmark swing is ARC-AGI-2: 4.9% for GLM-5 and 84.6% for GPT-5.5 Pro.
- GLM-5 is cheaper at $1 / $3.20 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 205K.
- GLM-5 has downloadable open weights; the other is API-only.
Side by side
| GLM-5 | GPT-5.5 Pro | |
|---|---|---|
| Provider | Z.ai (Zhipu) | OpenAI |
| Noometry Index | 46.1 | 64.3 |
| Released | 2026-02-11 | 2026-04-23 |
| Weights | Open | Proprietary |
| Context window | 205K | 1.05M |
| Max output | 131K | 128K |
| Input $ / M tokens | $1 | $30 |
| Output $ / M tokens | $3.20 | $180 |
| Results tracked | 45 | 14 |
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Category by category
Coding Not comparable
GLM-5: 49.0 (#52), GPT-5.5 Pro: —
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| SWE-bench Verified | 72.1% | — |
| SWE-bench Verified (bash only) | 72.8% | — |
| LMArena WebDev | 1434 | — |
| SWE-bench Multilingual | 69.7% | — |
| WeirdML | 48.2% | — |
| LMArena Coding | 1461 | — |
| ALE-Bench | 765.62 | — |
Agentic & Tool Use Not comparable
GLM-5: 31.1 (#71), GPT-5.5 Pro: —
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| Terminal-Bench | 52.4% | — |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Banking | 9.8% | — |
| τ²-bench Retail | 73.7% | — |
| τ²-bench Telecom | 86.8% | — |
| Vending-Bench 2 | 4,432 | — |
Reasoning GPT-5.5 Pro leads
GLM-5: 27.6 (#116), GPT-5.5 Pro: 73.3 (#10)
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| ARC-AGI-2 | 4.9% | 84.6% |
| SimpleBench | 53.2% | 76.9% |
| ARC-AGI-1 | 44.7% | 96.5% |
| Chess Puzzles | 10% | 64% |
| Epoch Capabilities Index | 145.83 | 162.07 |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | 74.8% | — |
| CritPt | — | 30.6% |
| LMArena Hard Prompts | 1452 | — |
| DTBench | — | 96% |
| LMCA | — | 53.9% |
| ForecastBench | 61 | — |
Math GPT-5.5 Pro leads
GLM-5: 46.4 (#71), GPT-5.5 Pro: 84.0 (#10)
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 80% | 100% |
| FrontierMath (Feb 2025 set) | 16.4% | 52.4% |
| FrontierMath Tier 4 (v1) | 2.1% | 39.6% |
| FrontierMath (Tiers 1-3) | — | 87.7% |
| FrontierMath Tier 4 | — | 78% |
| MathArena Final-Answer Competitions | 65.7% | — |
| LMArena Math | 1440 | — |
Knowledge GPT-5.5 Pro leads
GLM-5: 52.3 (#64), GPT-5.5 Pro: 64.1 (#19)
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| GPQA Diamond | 87.8% | 93.9% |
| Vectara Hallucination Rate | 10.1% | — |
| LMArena Expert | 1454 | — |
Multilingual Not comparable
GLM-5: 53.7 (#58), GPT-5.5 Pro: —
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Non-English | 1430 | — |
| LMArena Chinese | 1511 | — |
| LMArena French | 1455 | — |
| LMArena German | 1445 | — |
| LMArena Japanese | 1416 | — |
| LMArena Korean | 1423 | — |
| LMArena Russian | 1436 | — |
| LMArena Spanish | 1454 | — |
Instruction Following Not comparable
GLM-5: 75.2 (#67), GPT-5.5 Pro: —
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Instruction Following | 1428 | — |
Long Context Not comparable
GLM-5: 44.7 (#60), GPT-5.5 Pro: —
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| CL-bench | 18.7% | — |
| LMArena Longer Query | 1446 | — |
Writing & Preference Not comparable
GLM-5: 66.0 (#38), GPT-5.5 Pro: —
| Benchmark | GLM-5 | GPT-5.5 Pro |
|---|---|---|
| LMArena Text | 1446 | — |
| LMArena Creative Writing | 1439 | — |
| EQ-Bench Creative Writing | 1601 | — |
| LMArena Multi-Turn | 1456 | — |
Frequently asked questions
Is GLM-5 better than GPT-5.5 Pro?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 46.1 on the Noometry Index. GLM-5 costs 44× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GLM-5 or GPT-5.5 Pro?
GLM-5 is cheaper. It lists at $1 per million input tokens and $3.20 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 205K.
How many benchmarks do GLM-5 and GPT-5.5 Pro share?
9 benchmarks have published results for both models. GLM-5 has 45 scored results on Noometry and GPT-5.5 Pro has 14.