Model Comparison
Solar Mini 4
vs. Step 3.5 Flash 2603
Comparing 2 AI models · 0 benchmarks · Upstage, StepFun
Recommended Pick
UpSolar Mini 44 metric winsStrongest on: Value, TTFT, Reasoning
Best Value
Solar Mini 4
100.0 value score
24.1 reasoning / $0.18/1M
Lowest Price
Solar Mini 4
$0.10/1M input price
Best Reasoning
Solar Mini 4
24.1 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Best value
Solar Mini 4 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Speed gap
Step 3.5 Flash 2603 generates about 1.8x as many tokens per second as Solar Mini 4.
Reasoning gap
Solar Mini 4 leads Step 3.5 Flash 2603 by 7.1 points on reasoning.
Top-pick rationale
Solar Mini 4 wins 4 measurable categories, including Value, TTFT, Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Solar Mini 4
Upstage
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Step 3.5 Flash 2603
StepFun
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
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Full Comparison
| Metric | Top Pick Up Solar Mini 4 | St Step 3.5 Flash 2603 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.10/1M | $0.10/1M |
| Output Cost | $0.40/1M | $0.30/1M |
| Blended (3:1) | $0.18/1M | $0.15/1M |
| Specifications | ||
| Organization | Upstage | StepFun |
| Release Date | Sep 22, 2026 | Apr 2, 2026 |
| Performance & Speed | ||
| Throughput | 81.1 tok/s | 147.6 tok/s |
| TTFT | 1840ms | 3320ms |
| Latency | 26510ms | 16870ms |
| Composite Indices | ||
| Value Score | 100.0 | 82.3 |
| Reasoning Score | 24.1 | 17.0 |
| Intelligence | 24.1 | 17.0 |
Key Takeaways
Solar Mini 4 offers the best value at $0.10/1M,making it ideal for high-volume applications and cost-conscious projects.
Solar Mini 4 has the strongest reasoning profile with a 24.1 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
Solar Mini 4
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
Step 3.5 Flash 2603
- General-purpose AI
- Versatile applications
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