Model Comparison
Solar Pro 3
vs. Step 3.5 Flash
Comparing 2 AI models · 0 benchmarks · Upstage, StepFun
Recommended Pick
StStep 3.5 Flash9 metric winsStrongest on: Value, Input price, Output price
Best Value
Step 3.5 Flash
100.0 value score
26.0 reasoning / $0.15/1M
Lowest Price
Step 3.5 Flash
$0.10/1M input price
Best Reasoning
Step 3.5 Flash
26.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
Solar Pro 3
16.2 coding index
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 1.5x cheaper on input tokens than Solar Pro 3.
Speed gap
Step 3.5 Flash generates about 1.5x as many tokens per second as Solar Pro 3.
Reasoning gap
Step 3.5 Flash leads Solar Pro 3 by 11.5 points on reasoning.
Top-pick rationale
Step 3.5 Flash wins 9 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.
Solar Pro 3
Upstage
TTFT
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Time
—
tok/s
—
Tokens
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Cost
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Step 3.5 Flash
StepFun
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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OpenAI-compatible inference
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Full Comparison
| Metric | Up Solar Pro 3 | Top Pick St Step 3.5 Flash |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.15/1M | $0.10/1M |
| Output Cost | $0.60/1M | $0.30/1M |
| Blended (3:1) | $0.26/1M | $0.15/1M |
| Specifications | ||
| Organization | Upstage | StepFun |
| Release Date | Apr 6, 2026 | Feb 2, 2026 |
| Performance & Speed | ||
| Throughput | 143.9 tok/s | 214.0 tok/s |
| TTFT | 2440ms | 1050ms |
| Latency | 16330ms | 10400ms |
| Composite Indices | ||
| Value Score | 31.9 | 100.0 |
| Reasoning Score | 14.5 | 26.0 |
| Intelligence | 14.5 | 26.0 |
| Coding | 16.2 | — |
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.
Step 3.5 Flash has the strongest reasoning profile with a 26.0 reasoning score,combining the available reasoning-heavy benchmarks.
Solar Pro 3 reaches a 16.2 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
Solar Pro 3
- Code generation
- Software development
Step 3.5 Flash
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
