Model Comparison
Solar Pro 4
vs. Step 5 Preview
Comparing 2 AI models · 0 benchmarks · Upstage, StepFun
Recommended Pick
UpSolar Pro 45 metric winsStrongest on: Value, Input price, Output price
Best Value
Solar Pro 4
100.0 value score
28.2 reasoning / $0.52/1M
Lowest Price
Solar Pro 4
$0.30/1M input price
Best Reasoning
Step 5 Preview
43.7 reasoning score
Blends available reasoning benchmarks
Best for Coding
Solar Pro 4
52.7 coding index
Differences That Matter
Best value
Solar Pro 4 has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Solar Pro 4 is 3.3x cheaper on input tokens than Step 5 Preview.
Speed gap
Step 5 Preview generates about 1.4x as many tokens per second as Solar Pro 4.
Reasoning gap
Step 5 Preview leads Solar Pro 4 by 15.5 points on reasoning.
Top-pick rationale
Solar Pro 4 wins 5 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 4
Upstage
TTFT
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Time
—
tok/s
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Tokens
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Cost
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Step 5 Preview
StepFun
TTFT
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Time
—
tok/s
—
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 Up Solar Pro 4 | St Step 5 Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $0.30/1M | $1.00/1M |
| Output Cost | $1.20/1M | $2.70/1M |
| Blended (3:1) | $0.52/1M | $1.43/1M |
| Specifications | ||
| Organization | Upstage | StepFun |
| Release Date | Aug 6, 2026 | Sep 18, 2026 |
| Performance & Speed | ||
| Throughput | 65.6 tok/s | 92.1 tok/s |
| TTFT | 2030ms | 3550ms |
| Latency | 32510ms | 25250ms |
| Composite Indices | ||
| Value Score | 100.0 | 57.1 |
| Reasoning Score | 28.2 | 43.7 |
| Intelligence | 28.2 | 43.7 |
| Coding | 52.7 | — |
Key Takeaways
Solar Pro 4 offers the best value at $0.30/1M,making it ideal for high-volume applications and cost-conscious projects.
Step 5 Preview has the strongest reasoning profile with a 43.7 reasoning score,combining the available reasoning-heavy benchmarks.
Solar Pro 4 reaches a 52.7 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 4
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
Step 5 Preview
- Complex reasoning tasks
- Research & analysis
