Model Comparison
Step 3.5 Flash 2603
vs. Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
Comparing 2 AI models · 0 benchmarks · StepFun, Anthropic
Recommended Pick
StStep 3.5 Flash 26037 metric winsStrongest on: Value, Input price, Output price
Best Value
Step 3.5 Flash 2603
100.0 value score
26.5 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash 2603
$0.10/1M input price
Best Reasoning
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
62.5 reasoning score
Blends available reasoning benchmarks
Best for Coding
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
77.0 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 50x cheaper on input tokens than Claude Opus 5 (Adaptive Reasoning, Xhigh Effort).
Speed gap
Step 3.5 Flash 2603 generates about 3.9x as many tokens per second as Claude Opus 5 (Adaptive Reasoning, Xhigh Effort).
Reasoning gap
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) leads Step 3.5 Flash 2603 by 36.0 points on reasoning.
Top-pick rationale
Step 3.5 Flash 2603 wins 7 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 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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Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
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 3.5 Flash 2603 | An Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | $5.00/1M |
| Output Cost | $0.30/1M | $25.00/1M |
| Blended (3:1) | $0.15/1M | $10.00/1M |
| Specifications | ||
| Organization | StepFun | Anthropic |
| Release Date | Apr 2, 2026 | Jul 24, 2026 |
| Performance & Speed | ||
| Throughput | 207.9 tok/s | 53.8 tok/s |
| TTFT | 1070ms | 35530ms |
| Latency | 10690ms | 35530ms |
| Composite Indices | ||
| Value Score | 100.0 | 3.5 |
| Reasoning Score | 26.5 | 62.5 |
| Intelligence | 26.5 | 62.5 |
| Coding | — | 77.0 |
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.
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) has the strongest reasoning profile with a 62.5 reasoning score,combining the available reasoning-heavy benchmarks.
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort) reaches a 77.0 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
Claude Opus 5 (Adaptive Reasoning, Xhigh Effort)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
