Model Comparison
Qwen3.5 4B (Reasoning)
vs. Solar Pro 2 (Non-reasoning)
Comparing 2 AI models · 12 benchmarks · Alibaba, Upstage
Recommended Pick
AlQwen3.5 4B (Reasoning)8 metric winsStrongest on: Throughput, Intelligence, GPQA
Lowest Price
Solar Pro 2 (Non-reasoning)
$0.00/1M input price
Best Reasoning
Solar Pro 2 (Non-reasoning)
36.7 reasoning score
Blends available reasoning benchmarks
Best for Coding
Qwen3.5 4B (Reasoning)
22.6 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 (Non-reasoning) is ∞x cheaper on input tokens than Qwen3.5 4B (Reasoning).
Reasoning gap
Solar Pro 2 (Non-reasoning) leads Qwen3.5 4B (Reasoning) by 1.7 points on reasoning.
Top-pick rationale
Qwen3.5 4B (Reasoning) wins 8 measurable categories, including Throughput, Intelligence, GPQA, HLE.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Qwen3.5 4B (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 (Non-reasoning)
Upstage
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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Which answer was more useful?
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Full Comparison
| Metric | Top Pick Al Qwen3.5 4B (Reasoning) | Up Solar Pro 2 (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 | Jul 9, 2025 |
| Performance & Speed | ||
| Throughput | 25.3 tok/s | — |
| TTFT | 398ms | — |
| Latency | 79571ms | — |
| Composite Indices | ||
| Value Score | 100.0 | — |
| Reasoning Score | 35.0 | 36.7 |
| Intelligence | 20.1 | 7.8 |
| Coding | 22.6 | — |
| Math | — | 30.0 |
| Standard Benchmarks | ||
| GPQA | 77.1% | 56.1% |
| MMLU Pro | — | 75.0% |
| HLE | 7.8% | 3.8% |
| LiveCodeBench | — | 42.4% |
| MATH 500 | — | 88.9% |
| AIME 2025 | — | 30.0% |
| AIME (Original) | — | 40.7% |
| SciCode | 16.1% | 24.8% |
| LCR | 55.7% | 0.0% |
| IFBench | 52.0% | 33.7% |
| TAU-bench v2 | 92.1% | 31.9% |
| TerminalBench Hard | 18.2% | 4.5% |
Key Takeaways
Solar Pro 2 (Non-reasoning) offers the best value at $0.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Solar Pro 2 (Non-reasoning) has the strongest reasoning profile with a 36.7 reasoning score,combining the available reasoning-heavy benchmarks.
Qwen3.5 4B (Reasoning) reaches a 22.6 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 (Reasoning)
- Code generation
- Software development
Solar Pro 2 (Non-reasoning)
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
