Model comparison
Qwen3.5 Plus vs Solar Pro4
Qwen3.5 Plus and Solar Pro4 score almost the same on the Noometry Index (42.9 vs 42.1), so choose on price, context window or the category you care about most.
Last verified . 0 shared benchmarks.
Alibaba (Qwen)
UpstageSummary
- The widest gap is in math, where Qwen3.5 Plus leads 49.6 to 38.8.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $0.40 / $2.40 for Qwen3.5 Plus.
- Qwen3.5 Plus accepts more context: 1M tokens versus 524K.
Side by side
| Qwen3.5 Plus | Solar Pro4 | |
|---|---|---|
| Provider | Alibaba (Qwen) | Upstage |
| Noometry Index | 42.9 | 42.1 |
| Released | 2026-02-16 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 524K |
| Max output | 66K | 131K |
| Input $ / M tokens | $0.40 | $0.30 |
| Output $ / M tokens | $2.40 | $1.20 |
| Results tracked | 15 | 18 |
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Category by category
Coding Not comparable
Qwen3.5 Plus: —, Solar Pro4: 40.1 (#149)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| LMArena WebDev | — | 1371 |
| LMArena Coding | — | 1437 |
| ALE-Bench | 621.92 | — |
Agentic & Tool Use Not comparable
Qwen3.5 Plus: —, Solar Pro4: —
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| Vending-Bench 2 | 0.54 | — |
Reasoning Qwen3.5 Plus leads
Qwen3.5 Plus: 32.8 (#74), Solar Pro4: 28.5 (#104)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| Chess Puzzles | 22% | — |
| LMArena Hard Prompts | — | 1399 |
| Mystery Game Puzzles | 17% | — |
| DTBench | 80.5% | — |
| LMCA | 36.4% | — |
| Epoch Capabilities Index | 146.78 | — |
Math Qwen3.5 Plus leads
Qwen3.5 Plus: 49.6 (#61), Solar Pro4: 38.8 (#128)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 86.7% | — |
| LMArena Math | — | 1416 |
| FrontierMath (Feb 2025 set) | 21% | — |
| FrontierMath Tier 4 (v1) | 2.1% | — |
Knowledge Qwen3.5 Plus leads
Qwen3.5 Plus: 46.0 (#83), Solar Pro4: 39.8 (#129)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| GPQA Diamond | 84.8% | — |
| SimpleQA Verified | 25.4% | — |
| Vectara Hallucination Rate | 10.7% | — |
| LMArena Expert | — | 1427 |
Multilingual Not comparable
Qwen3.5 Plus: —, Solar Pro4: 48.7 (#139)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1361 |
| LMArena Chinese | — | 1415 |
| LMArena French | — | 1397 |
| LMArena German | — | 1364 |
| LMArena Japanese | — | 1309 |
| LMArena Korean | — | 1382 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1401 |
Instruction Following Not comparable
Qwen3.5 Plus: —, Solar Pro4: 72.7 (#132)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1377 |
Long Context Too close to call
Qwen3.5 Plus: 43.0 (#113), Solar Pro4: 42.1 (#130)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| CL-bench | 19.8% | — |
| CL-bench Life | 12.4% | — |
| LMArena Longer Query | — | 1381 |
Writing & Preference Not comparable
Qwen3.5 Plus: —, Solar Pro4: 56.5 (#138)
| Benchmark | Qwen3.5 Plus | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1316 |
| LMArena Multi-Turn | — | 1385 |
Frequently asked questions
Is Qwen3.5 Plus better than Solar Pro4?
Qwen3.5 Plus and Solar Pro4 score almost the same on the Noometry Index (42.9 vs 42.1), so choose on price, context window or the category you care about most.
Which is cheaper, Qwen3.5 Plus or Solar Pro4?
Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; Qwen3.5 Plus lists at $0.40 and $2.40.
Which has the bigger context window?
Qwen3.5 Plus does, with 1M tokens against 524K.
How many benchmarks do Qwen3.5 Plus and Solar Pro4 share?
0 benchmarks have published results for both models. Qwen3.5 Plus has 15 scored results on Noometry and Solar Pro4 has 18.