Model Comparison
Step 3.5 Flash
vs. Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
Comparing 2 AI models · 0 benchmarks · StepFun, Anthropic
Recommended Pick
StStep 3.5 Flash4 metric winsStrongest on: Value, Input price, Output price
Best Value
Step 3.5 Flash
100.0 value score
16.6 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash
$0.10/1M input price
Best Reasoning
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
57.6 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Best value
Step 3.5 Flash has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Step 3.5 Flash is 40x cheaper on input tokens than Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback).
Reasoning gap
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) leads Step 3.5 Flash by 41.0 points on reasoning.
Top-pick rationale
Step 3.5 Flash wins 4 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 3.5 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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Claude Opus 5.5 (Adaptive Reasoning, Max Effort, 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?
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 | Top Pick St Step 3.5 Flash | An Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | $4.00/1M |
| Output Cost | $0.30/1M | $20.00/1M |
| Blended (3:1) | $0.15/1M | $8.00/1M |
| Specifications | ||
| Organization | StepFun | Anthropic |
| Release Date | Feb 2, 2026 | Sep 22, 2026 |
| Performance & Speed | ||
| Throughput | 131.2 tok/s | — |
| TTFT | 3440ms | — |
| Latency | 18680ms | — |
| Composite Indices | ||
| Value Score | 100.0 | 6.5 |
| Reasoning Score | 16.6 | 57.6 |
| Intelligence | 16.6 | 57.6 |
Key Takeaways
Step 3.5 Flash offers the best value at $0.10/1M,making it ideal for high-volume applications and cost-conscious projects.
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback) has the strongest reasoning profile with a 57.6 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 3.5 Flash
- Cost-sensitive applications
- High-volume processing
Claude Opus 5.5 (Adaptive Reasoning, Max Effort, Default Fallback)
- Complex reasoning tasks
- Research & analysis
