Model Comparison
Qwen3.5 4B (Non-reasoning)
vs. Step 3.5 Flash 2603
Comparing 2 AI models · 7 benchmarks · Alibaba, StepFun
Recommended Pick
StStep 3.5 Flash 26039 metric winsStrongest on: Throughput, Reasoning, Intelligence
Best Value
Qwen3.5 4B (Non-reasoning)
100.0 value score
31.6 reasoning / $0.06/1M
Lowest Price
Qwen3.5 4B (Non-reasoning)
$0.03/1M input price
Best Reasoning
Step 3.5 Flash 2603
43.7 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
Best value
Qwen3.5 4B (Non-reasoning) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Qwen3.5 4B (Non-reasoning) is 3.3x cheaper on input tokens than Step 3.5 Flash 2603.
Speed gap
Step 3.5 Flash 2603 generates about 7.6x as many tokens per second as Qwen3.5 4B (Non-reasoning).
Reasoning gap
Step 3.5 Flash 2603 leads Qwen3.5 4B (Non-reasoning) by 12.2 points on reasoning.
Top-pick rationale
Step 3.5 Flash 2603 wins 9 measurable categories, including Throughput, Reasoning, Intelligence, GPQA.
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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Step 3.5 Flash 2603
StepFun
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 | Al Qwen3.5 4B (Non-reasoning) | Top Pick St Step 3.5 Flash 2603 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.03/1M | $0.10/1M |
| Output Cost | $0.15/1M | $0.30/1M |
| Blended (3:1) | $0.06/1M | $0.15/1M |
| Specifications | ||
| Organization | Alibaba | StepFun |
| Release Date | Mar 2, 2026 | Apr 2, 2026 |
| Performance & Speed | ||
| Throughput | 27.0 tok/s | 206.0 tok/s |
| TTFT | 446ms | 760ms |
| Latency | 446ms | 10471ms |
| Composite Indices | ||
| Value Score | 100.0 | 55.4 |
| Reasoning Score | 31.6 | 43.7 |
| Intelligence | 16.0 | 26.0 |
| Coding | 20.3 | — |
| Standard Benchmarks | ||
| GPQA | 71.2% | 82.6% |
| HLE | 7.5% | 22.6% |
| SciCode | 18.3% | 38.5% |
| LCR | 28.3% | 54.3% |
| IFBench | 33.3% | 66.5% |
| TAU-bench v2 | 87.7% | 87.4% |
| TerminalBench Hard | 11.4% | 32.6% |
Key Takeaways
Qwen3.5 4B (Non-reasoning) offers the best value at $0.03/1M,making it ideal for high-volume applications and cost-conscious projects.
Step 3.5 Flash 2603 has the strongest reasoning profile with a 43.7 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)
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
Step 3.5 Flash 2603
- Complex reasoning tasks
- Research & analysis
