Model Comparison
Phi-4
vs. Step 3.5 Flash 2603
Comparing 2 AI models · 12 benchmarks · Microsoft, StepFun
Recommended Pick
StStep 3.5 Flash 260314 metric winsStrongest on: Value, Input price, Output price
Best Value
Step 3.5 Flash 2603
100.0 value score
43.7 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Step 3.5 Flash 2603
43.7 reasoning score
Blends available reasoning benchmarks
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Step 3.5 Flash 2603 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 3.5 Flash 2603 is 1.3x cheaper on input tokens than Phi-4.
Speed gap
Step 3.5 Flash 2603 generates about 8.4x as many tokens per second as Phi-4.
Reasoning gap
Step 3.5 Flash 2603 leads Phi-4 by 15.5 points on reasoning.
Top-pick rationale
Step 3.5 Flash 2603 wins 14 measurable categories, including Value, Input price, Output price, Blended price.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Phi-4
Microsoft
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
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | Mi Phi-4 | Top Pick St Step 3.5 Flash 2603 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.13/1M | $0.10/1M |
| Output Cost | $0.50/1M | $0.30/1M |
| Blended (3:1) | $0.22/1M | $0.15/1M |
| Specifications | ||
| Organization | Microsoft | StepFun |
| Release Date | Dec 12, 2024 | Apr 2, 2026 |
| Performance & Speed | ||
| Throughput | 27.5 tok/s | 232.0 tok/s |
| TTFT | 654ms | 740ms |
| Latency | 654ms | 9359ms |
| Composite Indices | ||
| Value Score | 44.3 | 100.0 |
| Reasoning Score | 28.3 | 43.7 |
| Intelligence | 4.9 | 26.0 |
| Math | 18.0 | — |
| Standard Benchmarks | ||
| GPQA | 57.5% | 82.6% |
| MMLU Pro | 71.4% | — |
| HLE | 4.1% | 22.6% |
| LiveCodeBench | 23.1% | — |
| MATH 500 | 81.0% | — |
| AIME 2025 | 18.0% | — |
| AIME (Original) | 14.3% | — |
| SciCode | 26.0% | 38.5% |
| LCR | 0.0% | 54.3% |
| IFBench | 23.5% | 66.5% |
| TAU-bench v2 | 0.0% | 87.4% |
| TerminalBench Hard | 3.8% | 32.6% |
Key Takeaways
Step 3.5 Flash 2603 offers the best value at $0.10/1M,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.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Phi-4
- General-purpose AI
- Versatile applications
Step 3.5 Flash 2603
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
