Model Comparison
Sonar
vs. Step 3.5 Flash 2603
Comparing 2 AI models · 0 benchmarks · Perplexity, StepFun
Recommended Pick
StStep 3.5 Flash 26032 metric winsStrongest on: Reasoning, Intelligence
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Step 3.5 Flash 2603
19.5 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Reasoning gap
Step 3.5 Flash 2603 leads Sonar by 15.7 points on reasoning.
Top-pick rationale
Step 3.5 Flash 2603 wins 2 measurable categories, including Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Sonar
Perplexity
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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OpenAI-compatible inference
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Full Comparison
| Metric | Pe Sonar | Top Pick St Step 3.5 Flash 2603 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | — | $0.10/1M |
| Output Cost | — | $0.30/1M |
| Blended (3:1) | — | $0.15/1M |
| Specifications | ||
| Organization | Perplexity | StepFun |
| Release Date | Jan 21, 2025 | Apr 2, 2026 |
| Performance & Speed | ||
| Throughput | — | 216.7 tok/s |
| TTFT | — | 1110ms |
| Latency | — | 10340ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 3.8 | 19.5 |
| Intelligence | 3.8 | 19.5 |
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 19.5 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
Sonar
- General-purpose AI
- Versatile applications
Step 3.5 Flash 2603
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
