GPT-5.6 Sol vs Qwen3.5 Plus 2026-04-20
GPT-5.6 Sol 
Qwen3.5 Plus 2026-04-20 Verdict
- GPT-5.6 Sol (high) leads on quality: 66.0 vs 57.3.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, instruction following, knowledge, long context, multimodal, reasoning.
- Qwen3.5 Plus 2026-04-20 (thinking) is stronger in maths.
- Qwen3.5 Plus 2026-04-20 (thinking) is 6.2× cheaper ($1.29 vs $8.00 per 1M blended).
| Metric | GPT-5.6 Sol (high) | Qwen3.5 Plus 2026-04-20 (thinking) |
|---|---|---|
| BenchLeader Index | 66.0 | 57.3 |
| Agents & tools score | 82.5 | – |
| Coding score | 72.4 | 61.8 |
| Composite score | 75.7 | – |
| Instruction following score | 64.7 | – |
| Knowledge score | 70.4 | 60.5 |
| Long context score | 65.1 | – |
| Multimodal score | 65.5 | – |
| Reasoning score | 63.3 | – |
| Maths score | – | 60.6 |
| Blended price $/M | $8.00 | $1.29 |
| Output speed | 61 tok/s | 52 tok/s |
| Time to first answer | 12.6 s | 0.9 s |
| Context window | 1.1M | 1M |
| SciCode | 56.9% | – |
| WeirdML | 88.8% | – |
| AA Intelligence Index | 42.5 | – |
| IFBench | 69.2% | – |
| AA-LCR | 81.7% | – |
| MMMU-Pro | 81.8% | – |
| AA-Omniscience | 20.4 | – |
| Terminal-Bench Hard | 62.1% | – |
| GPQA Diamond (AA) | 92.8% | – |
| Humanity's Last Exam (AA) | 46.0% | – |
| SciCode (AA) | 57.8% | – |
| τ²-Bench Telecom (AA) | 83.3% | – |
| 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% |
| EnigmaEval | 37.1% | – |
| ARC-AGI-1 | 97.0% | – |
| ARC-AGI-2 | 85.4% | – |
| ARC-AGI-3 | 2.2% | – |
Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Sol vs Qwen3.5 Plus 2026-04-20: questions
- Is GPT-5.6 Sol better than Qwen3.5 Plus 2026-04-20?
- GPT-5.6 Sol (high) leads on quality: 66.0 vs 57.3. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Sol (high) is ahead overall as of 2026-09-13, but check the category scores for your use.
- Is GPT-5.6 Sol better than Qwen3.5 Plus 2026-04-20 for coding?
- GPT-5.6 Sol scores higher in coding (72 vs 62 on the category index, where 50 is average).
- Which is cheaper, GPT-5.6 Sol or Qwen3.5 Plus 2026-04-20?
- Qwen3.5 Plus 2026-04-20 is cheaper: $1.29 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.6 Sol or Qwen3.5 Plus 2026-04-20?
- GPT-5.6 Sol streams faster: 61 against 52 output tokens per second.
- Which has the larger context window?
- GPT-5.6 Sol accepts more context: 1.1M against 1M tokens.