GPT-5.5 Pro vs Qwen3.8-Flash-Next
GPT-5.5 Pro 
Qwen3.8-Flash-Next Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 61.6.
- GPT-5.5 Pro (xhigh) is stronger in maths, reasoning.
- Qwen3.8-Flash-Next is stronger in agents & tools, coding, composite, knowledge, long context, multimodal.
- Qwen3.8-Flash-Next is 293× cheaper ($0.230 vs $67.50 per 1M blended).
- Qwen3.8-Flash-Next streams 13.9× faster (55 vs 4 tokens per second).
| Metric | GPT-5.5 Pro (xhigh) | Qwen3.8-Flash-Next |
|---|---|---|
| BenchLeader Index | 67.1 | 61.6 |
| Maths score | 74.5 | – |
| Reasoning score | 80.1 | 63.4 |
| Agents & tools score | – | 65.8 |
| Coding score | – | 71.2 |
| Composite score | – | 67.4 |
| Knowledge score | – | 59.6 |
| Long context score | – | 66.3 |
| Multimodal score | – | 64.3 |
| Blended price $/M | $67.50 | $0.230 |
| Output speed | 4 tok/s | 55 tok/s |
| Time to first answer | 3.5 s | 39.0 s |
| Context window | 1.1M | 256k |
| FrontierMath Tiers 1–3 | 87.7% | – |
| FrontierMath Tier 4 | 78.0% | – |
| LMArena WebDev | – | 1635 |
| LMArena Agent | – | -0.1 |
| LiveBench | – | 76.2% |
| LiveBench Reasoning | – | 87.4% |
| LiveBench Coding | – | 72.5% |
| LiveBench Agentic Coding | – | 61.6% |
| LiveBench Mathematics | – | 85.8% |
| LiveBench Data Analysis | – | 74.2% |
| LiveBench Language | – | 74.6% |
| LiveBench Instruction Following | – | 77.1% |
| AA Intelligence Index | – | 39.9 |
| AA-LCR | – | 79.7% |
| MMMU-Pro | – | 79.8% |
| AA-Omniscience | – | -9.7 |
| GPQA Diamond (AA) | – | 92.3% |
| Humanity's Last Exam (AA) | – | 38.0% |
| SciCode (AA) | – | 50.6% |
| ARC-AGI-1 | 95.0% | – |
| ARC-AGI-2 | 84.2% | – |
| CritPt | 30.6% | 11.1% |
| GDPval (AA) | – | 57.4% |
| τ²-Bench Banking (AA) | – | 45.4% |
| LMCA | 53.9% | – |
| DTBench | 96.0% | – |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
GPT-5.5 Pro vs Qwen3.8-Flash-Next: questions
- Is GPT-5.5 Pro better than Qwen3.8-Flash-Next?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 61.6. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 Pro (xhigh) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, GPT-5.5 Pro or Qwen3.8-Flash-Next?
- Qwen3.8-Flash-Next is cheaper: $0.230 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.5 Pro or Qwen3.8-Flash-Next?
- Qwen3.8-Flash-Next streams faster: 55 against 4 output tokens per second.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 256k tokens.