Model Comparison
Step 3.5 Flash 2603
vs. Step 3.7 Flash
Comparing 2 AI models · 0 benchmarks · StepFun
Recommended Pick
StStep 3.7 Flash5 metric winsStrongest on: Throughput, TTFT, Latency
Best Value
Step 3.5 Flash 2603
100.0 value score
17.0 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Step 3.7 Flash
19.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
Step 3.7 Flash
39.6 coding index
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 2.0x cheaper on input tokens than Step 3.7 Flash.
Speed gap
Step 3.7 Flash generates about 1.8x as many tokens per second as Step 3.5 Flash 2603.
Reasoning gap
Step 3.7 Flash leads Step 3.5 Flash 2603 by 2.5 points on reasoning.
Top-pick rationale
Step 3.7 Flash wins 5 measurable categories, including Throughput, TTFT, Latency, Reasoning.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
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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Step 3.7 Flash
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?
Secure AI Chat made in Europe
Use Claude, ChatGPT, Gemini alongside with EU-Hosted Models like Deepseek, Qwen & Kimi.
EU-hosted inference
Servers in Germany & Finland. Designed to meet strict GDPR and ISO 27001 compliance requirements.
Full Comparison
| Metric | St Step 3.5 Flash 2603 | Top Pick St Step 3.7 Flash |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | $0.20/1M |
| Output Cost | $0.30/1M | $1.15/1M |
| Blended (3:1) | $0.15/1M | $0.44/1M |
| Specifications | ||
| Organization | StepFun | StepFun |
| Release Date | Apr 2, 2026 | May 29, 2026 |
| Performance & Speed | ||
| Throughput | 106.4 tok/s | 194.3 tok/s |
| TTFT | 3510ms | 2560ms |
| Latency | 22310ms | 12850ms |
| Composite Indices | ||
| Value Score | 100.0 | 39.3 |
| Reasoning Score | 17.0 | 19.5 |
| Intelligence | 17.0 | 19.5 |
| Coding | — | 39.6 |
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 3.7 Flash has the strongest reasoning profile with a 19.5 reasoning score,combining the available reasoning-heavy benchmarks.
Step 3.7 Flash reaches a 39.6 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
Step 3.5 Flash 2603
- Cost-sensitive applications
- High-volume processing
Step 3.7 Flash
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
