GPT-5.5 Pro vs Qwen3.8 27B
GPT-5.5 Pro 
Qwen3.8 27B Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 59.2.
- GPT-5.5 Pro (xhigh) is stronger in maths, reasoning.
- Qwen3.8 27B (xhigh) is stronger in agents & tools, coding, composite, knowledge, long context, multimodal.
- Qwen3.8 27B (xhigh) is 72× cheaper ($0.938 vs $67.50 per 1M blended).
- Qwen3.8 27B (xhigh) streams 10.6× faster (42 vs 4 tokens per second).
| Metric | GPT-5.5 Pro (xhigh) | Qwen3.8 27B (xhigh) |
|---|---|---|
| BenchLeader Index | 67.1 | 59.2 |
| Maths score | 74.5 | – |
| Reasoning score | 80.1 | 52.5 |
| Agents & tools score | – | 67.3 |
| Coding score | – | 53.2 |
| Composite score | – | 72.0 |
| Knowledge score | – | 56.4 |
| Long context score | – | 67.5 |
| Multimodal score | – | 60.7 |
| Blended price $/M | $67.50 | $0.938 |
| Output speed | 4 tok/s | 42 tok/s |
| Time to first answer | 3.5 s | 51.0 s |
| Context window | 1.1M | 262k |
| FrontierMath Tiers 1–3 | 87.7% | – |
| FrontierMath Tier 4 | 78.0% | – |
| SciCode | – | 44.7% |
| AA Intelligence Index | – | 33.9 |
| AA-LCR | – | 82.0% |
| MMMU-Pro | – | 76.3% |
| AA-Omniscience | – | -10.0 |
| GPQA Diamond (AA) | – | 90.5% |
| Humanity's Last Exam (AA) | – | 33.9% |
| SciCode (AA) | – | 46.6% |
| LiveCodeBench | – | 84.0% |
| MMLU-Pro | – | 84.3% |
| IOI | – | 39.1% |
| LegalBench | – | 82.4% |
| TaxEval | – | 70.8% |
| Terminal-Bench 2.1 (Vals) | – | 58.4% |
| SWE-bench (Vals) | – | 86.0% |
| GPQA Diamond (Vals) | – | 88.9% |
| Vals Index | – | 48.5 |
| ARC-AGI-1 | 95.0% | – |
| ARC-AGI-2 | 84.2% | – |
| CritPt | 30.6% | 5.4% |
| GDPval (AA) | – | 48.2% |
| τ²-Bench Banking (AA) | – | 48.0% |
| Code Migration | – | 14.2% |
| Excel Modeling Benchmark | – | 59.7% |
| Finance Agent v2 | – | 48.5% |
| Harvey's Legal Agent Benchmark | – | 11.3% |
| Legal Research Bench | – | 36.1% |
| MedCode | – | 28.7% |
| MedScribe | – | 83.8% |
| MMMU-Pro (Vals) | – | 83.9% |
| MortgageTax | – | 64.9% |
| ProgramBench | – | 0.0% |
| SAGE | – | 52.4% |
| SkillsBench | – | 38.1% |
| Terminal-Bench 4.0 (Vals) | – | 4.0% |
| Terminal-Bench Science | – | 1.4% |
| Vibe Code Bench v1.1 | – | 64.8% |
| Surface Evolver Bench | – | 45.0% |
| 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 27B: questions
- Is GPT-5.5 Pro better than Qwen3.8 27B?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 59.2. 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 27B?
- Qwen3.8 27B is cheaper: $0.938 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.5 Pro or Qwen3.8 27B?
- Qwen3.8 27B streams faster: 42 against 4 output tokens per second.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 262k tokens.