GLM 5.2 vs GPT-5.5
GLM 5.2 
GPT-5.5 Verdict
- GPT-5.5 leads on quality: 65.0 vs 57.7.
- GLM 5.2 (max) is stronger in coding, maths.
- GPT-5.5 is stronger in agents & tools, human preference, knowledge, reasoning, composite, instruction following, long context, multimodal.
- GLM 5.2 (max) is 5.2× cheaper ($2.15 vs $11.25 per 1M blended).
| Metric | GLM 5.2 (max) | GPT-5.5 |
|---|---|---|
| BenchLeader Index | 57.7 | 65.0 |
| Agents & tools score | 56.9 | 67.6 |
| Coding score | 63.8 | 57.2 |
| Human preference score | 67.3 | 67.7 |
| Knowledge score | 44.8 | 70.5 |
| Maths score | 55.8 | – |
| Reasoning score | 66.8 | 70.0 |
| Composite score | – | 71.1 |
| Instruction following score | – | 70.5 |
| Long context score | – | 66.6 |
| Multimodal score | – | 64.3 |
| Blended price $/M | $2.15 | $11.25 |
| Output speed | 75 tok/s | 91 tok/s |
| Time to first answer | 34.2 s | 49.6 s |
| Context window | 1M | 1.1M |
| GPQA Diamond | 91.9% | – |
| FrontierMath Tiers 1–3 | 59.2% | – |
| FrontierMath Tier 4 | 29.3% | – |
| OTIS Mock AIME | 86.4% | – |
| SWE-bench Verified (Epoch) | 78.7% | – |
| SimpleQA Verified | 34.2% | – |
| Terminal-Bench | – | 84.7% |
| SimpleBench | – | 69.0% |
| SciCode | 50.5% | – |
| Remote Labor Index | – | 6.3% |
| WeirdML | 70.1% | – |
| APEX-Agents | – | 38.5% |
| FrontierCode | – | 43.0% |
| ProofBench | 35.0% | – |
| Epoch Capabilities Index | – | 159.1 |
| LMArena Text | 1472 | 1476 |
| LMArena Hard Prompts | 1493 | 1498 |
| LMArena Coding | 1510 | 1509 |
| LMArena WebDev | 1592 | 1458 |
| LMArena Vision | – | 1296 |
| LMArena Agent | 4.6 | 2.8 |
| AA Intelligence Index | – | 38.6 |
| IFBench | – | 75.8% |
| AA-LCR | – | 84.3% |
| MMMU-Pro | – | 79.9% |
| AA-Omniscience | – | 20.5 |
| Terminal-Bench Hard | – | 60.6% |
| GPQA Diamond (AA) | – | 93.5% |
| Humanity's Last Exam (AA) | – | 45.8% |
| SciCode (AA) | – | 55.8% |
| τ²-Bench Telecom (AA) | – | 93.9% |
| Terminal-Bench 2.1 (Vals) | 67.8% | – |
| SWE-bench (Vals) | 82.8% | – |
| HiL-Bench | – | 39.7% |
| EQ-Bench 4 | – | 1315 |
| Kagi LLM Benchmark | – | 88.8% |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
GLM 5.2 vs GPT-5.5: questions
- Is GLM 5.2 better than GPT-5.5?
- GPT-5.5 leads on quality: 65.0 vs 57.7. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is GLM 5.2 better than GPT-5.5 for coding?
- GLM 5.2 scores higher in coding (64 vs 57 on the category index, where 50 is average).
- Is GLM 5.2 better than GPT-5.5 for agentic tasks?
- GPT-5.5 scores higher in agentic tasks (68 vs 57 on the category index, where 50 is average).
- Which is cheaper, GLM 5.2 or GPT-5.5?
- GLM 5.2 is cheaper: $2.15 against $11.25 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM 5.2 or GPT-5.5?
- GPT-5.5 streams faster: 91 against 75 output tokens per second.
- Which has the larger context window?
- GPT-5.5 accepts more context: 1.1M against 1M tokens.