GLM-5 vs GPT-5.5
GLM-5 
GPT-5.5 Verdict
- GPT-5.5 leads on quality: 66.7 vs 59.1.
- GLM-5 is stronger in maths.
- GPT-5.5 is stronger in agents & tools, coding, composite, human preference, instruction following, knowledge, long context, reasoning, multimodal.
- GLM-5 is 7.3× cheaper ($1.55 vs $11.25 per 1M blended).
| Metric | GLM-5 | GPT-5.5 |
|---|---|---|
| BenchLeader Index | 59.1 | 66.7 |
| Agents & tools score | 56.8 | 68.5 |
| Coding score | 52.9 | 57.2 |
| Composite score | 64.3 | 77.8 |
| Human preference score | 65.6 | 67.9 |
| Instruction following score | 70.5 | 73.6 |
| Knowledge score | 64.3 | 73.9 |
| Long context score | 64.3 | 68.8 |
| Maths score | 53.1 | – |
| Reasoning score | 51.5 | 70.1 |
| Multimodal score | – | 64.9 |
| Blended price $/M | $1.55 | $11.25 |
| Output speed | 66 tok/s | 85 tok/s |
| Time to first answer | 48.7 s | 58.6 s |
| Context window | 205k | 1.1M |
| GPQA Diamond | 87.8% | – |
| OTIS Mock AIME | 80.0% | – |
| SWE-bench Verified (Epoch) | 72.1% | – |
| Terminal-Bench | 52.4% | 84.7% |
| SimpleBench | 53.2% | 69.0% |
| Remote Labor Index | – | 6.3% |
| WeirdML | 48.2% | – |
| APEX-Agents | 17.2% | 38.5% |
| FrontierCode | – | 43.0% |
| Epoch Capabilities Index | 145.9 | 159.1 |
| LMArena Text | 1458 | 1477 |
| LMArena Hard Prompts | 1478 | 1498 |
| LMArena Coding | 1498 | 1509 |
| LMArena WebDev | 1436 | 1458 |
| LMArena Vision | – | 1296 |
| LMArena Agent | – | 3 |
| AA Intelligence Index | 27.9 | 38.6 |
| IFBench | 72.3% | 75.8% |
| AA-LCR | 75.7% | 84.3% |
| MMMU-Pro | – | 79.9% |
| AA-Omniscience | 0.3 | 20.5 |
| Terminal-Bench Hard | 43.2% | 60.6% |
| GPQA Diamond (AA) | 82.0% | 93.5% |
| Humanity's Last Exam (AA) | 29.3% | 45.8% |
| SciCode (AA) | – | 55.8% |
| τ²-Bench Telecom (AA) | 98.3% | 93.9% |
| AIME 2026 | 96.7% | – |
| HMMT February 2026 | 86.4% | – |
| MathArena Apex | 10.9% | – |
| HiL-Bench | – | 39.7% |
| EQ-Bench 4 | – | 1315 |
| Kagi LLM Benchmark | 51.7% | 88.8% |
| ARC-AGI-1 | 44.7% | – |
| ARC-AGI-2 | 4.9% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GLM-5 vs GPT-5.5: questions
- Is GLM-5 better than GPT-5.5?
- GPT-5.5 leads on quality: 66.7 vs 59.1. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GLM-5 better than GPT-5.5 for coding?
- GPT-5.5 scores higher in coding (57 vs 53 on the category index, where 50 is average).
- Is GLM-5 better than GPT-5.5 for agentic tasks?
- GPT-5.5 scores higher in agentic tasks (69 vs 57 on the category index, where 50 is average).
- Which is cheaper, GLM-5 or GPT-5.5?
- GLM-5 is cheaper: $1.55 against $11.25 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM-5 or GPT-5.5?
- GPT-5.5 streams faster: 85 against 66 output tokens per second.
- Which has the larger context window?
- GPT-5.5 accepts more context: 1.1M against 205k tokens.