Model comparison
GPT-6 Sol vs Qwen3.5 Plus
GPT-6 Sol is the stronger model overall, scoring 49.2 to 42.3 on the Noometry Index. Qwen3.5 Plus costs 4.4× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
Alibaba (Qwen)Summary
- They share 1 benchmark with published results for both. GPT-6 Sol scores higher in 2 categories and Qwen3.5 Plus in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6 Sol leads 49.3 to 32.0.
- Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $2 / $10 for GPT-6 Sol.
- GPT-6 Sol accepts more context: 1.05M tokens versus 1M.
Side by side
| GPT-6 Sol | Qwen3.5 Plus | |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 49.2 | 42.3 |
| Released | 2026-09-22 | 2026-02-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 1M |
| Max output | 128K | 66K |
| Input $ / M tokens | $2 | $0.40 |
| Output $ / M tokens | $10 | $2.40 |
| Results tracked | 22 | 15 |
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Category by category
Coding Not comparable
GPT-6 Sol: 59.6 (#11), Qwen3.5 Plus: —
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| DeepSWE | 68.8% | — |
| FrontierCode | 49.3% | — |
| LMArena WebDev | 1692 | — |
| LMArena Coding | 1453 | — |
| ALE-Bench | — | 621.92 |
Agentic & Tool Use Not comparable
GPT-6 Sol: 33.5 (#49), Qwen3.5 Plus: —
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| GDP.pdf | 28% | — |
| Vending-Bench 2 | — | 0.54 |
Reasoning GPT-6 Sol leads
GPT-6 Sol: 49.3 (#34), Qwen3.5 Plus: 32.0 (#67)
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| NYT Connections (extended) | 90.1% | — |
| Chess Puzzles | — | 22% |
| EBR-Bench | 53.3% | — |
| LMArena Hard Prompts | 1420 | — |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.79 |
Math Qwen3.5 Plus leads
GPT-6 Sol: 35.8 (#135), Qwen3.5 Plus: 47.9 (#55)
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| LMArena Math | 1404 | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Qwen3.5 Plus leads
GPT-6 Sol: 43.0 (#87), Qwen3.5 Plus: 46.0 (#78)
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| Vectara Hallucination Rate | 6.5% | 10.7% |
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| LMArena Expert | 1449 | — |
Multimodal Not comparable
GPT-6 Sol: 47.6 (#9), Qwen3.5 Plus: —
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| Furniture Assembly | 58.3% | — |
Multilingual Not comparable
GPT-6 Sol: 51.0 (#113), Qwen3.5 Plus: —
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1389 | — |
| LMArena Chinese | 1416 | — |
| LMArena Russian | 1407 | — |
| LMArena Spanish | 1377 | — |
Instruction Following Not comparable
GPT-6 Sol: 74.4 (#97), Qwen3.5 Plus: —
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1406 | — |
Long Context Too close to call
GPT-6 Sol: 43.2 (#100), Qwen3.5 Plus: 42.9 (#109)
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1415 | — |
Writing & Preference Not comparable
GPT-6 Sol: 72.3 (#15), Qwen3.5 Plus: —
| Benchmark | GPT-6 Sol | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1396 | — |
| LMArena Creative Writing | 1392 | — |
| EQ-Bench Creative Writing | 2125 | — |
| LMArena Multi-Turn | 1405 | — |
Frequently asked questions
Is GPT-6 Sol better than Qwen3.5 Plus?
GPT-6 Sol is the stronger model overall, scoring 49.2 to 42.3 on the Noometry Index. Qwen3.5 Plus costs 4.4× less per token, which makes it the better buy when GPT-6 Sol's lead doesn't matter for your workload.
Which is cheaper, GPT-6 Sol or Qwen3.5 Plus?
Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; GPT-6 Sol lists at $2 and $10.
Which has the bigger context window?
GPT-6 Sol does, with 1.05M tokens against 1M.
How many benchmarks do GPT-6 Sol and Qwen3.5 Plus share?
1 benchmark has published results for both models. GPT-6 Sol has 22 scored results on Noometry and Qwen3.5 Plus has 15.