Model Comparison
Step 5 Preview
vs. Claude Sonnet 5.5 (Max, Default Fallback)
Comparing 2 AI models · 0 benchmarks · StepFun, Anthropic
Recommended Pick
StStep 5 Preview6 metric winsStrongest on: Value, Input price, Output price
Best Value
Step 5 Preview
100.0 value score
43.7 reasoning / $1.43/1M
Lowest Price
Step 5 Preview
$1.00/1M input price
Best Reasoning
Claude Sonnet 5.5 (Max, Default Fallback)
56.0 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Best value
Step 5 Preview has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 5 Preview is 2.0x cheaper on input tokens than Claude Sonnet 5.5 (Max, Default Fallback).
Speed gap
Claude Sonnet 5.5 (Max, Default Fallback) generates about 1.5x as many tokens per second as Step 5 Preview.
Reasoning gap
Claude Sonnet 5.5 (Max, Default Fallback) leads Step 5 Preview by 12.3 points on reasoning.
Top-pick rationale
Step 5 Preview wins 6 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.
Step 5 Preview
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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Claude Sonnet 5.5 (Max, Default Fallback)
Anthropic
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 St Step 5 Preview | An Claude Sonnet 5.5 (Max, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.00/1M | $2.00/1M |
| Output Cost | $2.70/1M | $10.00/1M |
| Blended (3:1) | $1.43/1M | $4.00/1M |
| Specifications | ||
| Organization | StepFun | Anthropic |
| Release Date | Sep 18, 2026 | Sep 28, 2026 |
| Performance & Speed | ||
| Throughput | 90.9 tok/s | 134.9 tok/s |
| TTFT | 2840ms | 430230ms |
| Latency | 24850ms | 430230ms |
| Composite Indices | ||
| Value Score | 100.0 | 45.7 |
| Reasoning Score | 43.7 | 56.0 |
| Intelligence | 43.7 | 56.0 |
Key Takeaways
Step 5 Preview offers the best value at $1.00/1M,making it ideal for high-volume applications and cost-conscious projects.
Claude Sonnet 5.5 (Max, Default Fallback) has the strongest reasoning profile with a 56.0 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
Step 5 Preview
- Cost-sensitive applications
- High-volume processing
Claude Sonnet 5.5 (Max, Default Fallback)
- Complex reasoning tasks
- Research & analysis
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