GPT-5.5 vs Qwen3.5 Plus 2026-04-20
GPT-5.5 
Qwen3.5 Plus 2026-04-20 Verdict
- GPT-5.5 leads on quality: 65.0 vs 57.3.
- GPT-5.5 is stronger in agents & tools, composite, human preference, instruction following, knowledge, long context, multimodal, reasoning.
- Qwen3.5 Plus 2026-04-20 (thinking) is stronger in coding, maths.
- Qwen3.5 Plus 2026-04-20 (thinking) is 8.7× cheaper ($1.29 vs $11.25 per 1M blended).
- GPT-5.5 streams 1.7× faster (91 vs 52 tokens per second).
| Metric | GPT-5.5 | Qwen3.5 Plus 2026-04-20 (thinking) |
|---|---|---|
| BenchLeader Index | 65.0 | 57.3 |
| Agents & tools score | 67.6 | – |
| Coding score | 57.2 | 61.8 |
| Composite score | 71.1 | – |
| Human preference score | 67.7 | – |
| Instruction following score | 70.5 | – |
| Knowledge score | 70.5 | 60.5 |
| Long context score | 66.6 | – |
| Multimodal score | 64.3 | – |
| Reasoning score | 70.0 | – |
| Maths score | – | 60.6 |
| Blended price $/M | $11.25 | $1.29 |
| Output speed | 91 tok/s | 52 tok/s |
| Time to first answer | 49.6 s | 0.9 s |
| Context window | 1.1M | 1M |
| Terminal-Bench | 84.7% | – |
| SimpleBench | 69.0% | – |
| Remote Labor Index | 6.3% | – |
| APEX-Agents | 38.5% | – |
| FrontierCode | 43.0% | – |
| Epoch Capabilities Index | 159.1 | – |
| LMArena Text | 1476 | – |
| LMArena Hard Prompts | 1498 | – |
| LMArena Coding | 1509 | – |
| LMArena WebDev | 1458 | – |
| LMArena Vision | 1296 | – |
| LMArena Agent | 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% | – |
| AIME (Vals) | – | 86.0% |
| LiveCodeBench | – | 85.3% |
| MMLU-Pro | – | 87.2% |
| LegalBench | – | 85.1% |
| CorpFin | – | 65.3% |
| MedQA | – | 95.2% |
| SWE-bench (Vals) | – | 71.2% |
| GPQA Diamond (Vals) | – | 87.4% |
| 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.
GPT-5.5 vs Qwen3.5 Plus 2026-04-20: questions
- Is GPT-5.5 better than Qwen3.5 Plus 2026-04-20?
- GPT-5.5 leads on quality: 65.0 vs 57.3. 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 GPT-5.5 better than Qwen3.5 Plus 2026-04-20 for coding?
- Qwen3.5 Plus 2026-04-20 scores higher in coding (62 vs 57 on the category index, where 50 is average).
- Which is cheaper, GPT-5.5 or Qwen3.5 Plus 2026-04-20?
- Qwen3.5 Plus 2026-04-20 is cheaper: $1.29 against $11.25 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.5 or Qwen3.5 Plus 2026-04-20?
- GPT-5.5 streams faster: 91 against 52 output tokens per second.
- Which has the larger context window?
- GPT-5.5 accepts more context: 1.1M against 1M tokens.