Model Comparison
Qwen3.5 4B (Non-reasoning)
vs. Solar Pro 2 (Preview) (Non-reasoning)
Comparing 2 AI models · 11 benchmarks · Alibaba, Upstage
Recommended Pick
UpSolar Pro 2 (Preview) (Non-reasoning)6 metric winsStrongest on: Input price, Output price, TTFT
Lowest Price
Solar Pro 2 (Preview) (Non-reasoning)
$0.00/1M input price
Best Reasoning
Solar Pro 2 (Preview) (Non-reasoning)
37.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
Qwen3.5 4B (Non-reasoning)
20.3 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Price gap
Solar Pro 2 (Preview) (Non-reasoning) is ∞x cheaper on input tokens than Qwen3.5 4B (Non-reasoning).
Reasoning gap
Solar Pro 2 (Preview) (Non-reasoning) leads Qwen3.5 4B (Non-reasoning) by 5.4 points on reasoning.
Top-pick rationale
Solar Pro 2 (Preview) (Non-reasoning) wins 6 measurable categories, including Input price, Output price, TTFT, Latency.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Qwen3.5 4B (Non-reasoning)
Alibaba
TTFT
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Time
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tok/s
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Tokens
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Cost
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Solar Pro 2 (Preview) (Non-reasoning)
Upstage
TTFT
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Time
—
tok/s
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Tokens
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Cost
—
Which answer was more useful?
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Full Comparison
| Metric | Al Qwen3.5 4B (Non-reasoning) | Top Pick Up Solar Pro 2 (Preview) (Non-reasoning) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.03/1M | $0.00/1M |
| Output Cost | $0.15/1M | $0.00/1M |
| Blended (3:1) | $0.06/1M | — |
| Specifications | ||
| Organization | Alibaba | Upstage |
| Release Date | Mar 2, 2026 | May 20, 2025 |
| Performance & Speed | ||
| Throughput | 27.0 tok/s | — |
| TTFT | 462ms | — |
| Latency | 462ms | — |
| Composite Indices | ||
| Value Score | 100.0 | — |
| Reasoning Score | 31.6 | 37.0 |
| Intelligence | 16.0 | 10.0 |
| Coding | 20.3 | — |
| Standard Benchmarks | ||
| GPQA | 71.2% | 54.4% |
| MMLU Pro | — | 72.5% |
| HLE | 7.5% | 3.8% |
| LiveCodeBench | — | 38.5% |
| MATH 500 | — | 87.1% |
| AIME (Original) | — | 29.7% |
| SciCode | 18.3% | 27.2% |
| LCR | 28.3% | — |
| IFBench | 33.3% | — |
| TAU-bench v2 | 87.7% | — |
| TerminalBench Hard | 11.4% | — |
Key Takeaways
Solar Pro 2 (Preview) (Non-reasoning) offers the best value at $0.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Solar Pro 2 (Preview) (Non-reasoning) has the strongest reasoning profile with a 37.0 reasoning score,combining the available reasoning-heavy benchmarks.
Qwen3.5 4B (Non-reasoning) reaches a 20.3 coding index,making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Qwen3.5 4B (Non-reasoning)
- Code generation
- Software development
Solar Pro 2 (Preview) (Non-reasoning)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
