Model Comparison
Solar Open 100B (Reasoning)
vs. Step 5 Preview
Comparing 2 AI models · 0 benchmarks · Upstage, StepFun
Recommended Pick
StStep 5 Preview2 metric winsStrongest on: Reasoning, Intelligence
Lowest Price
Step 5 Preview
$1.00/1M input price
Best Reasoning
Step 5 Preview
43.7 reasoning score
Blends available reasoning benchmarks
Differences That Matter
Reasoning gap
Step 5 Preview leads Solar Open 100B (Reasoning) by 33.3 points on reasoning.
Top-pick rationale
Step 5 Preview wins 2 measurable categories, including Reasoning, Intelligence.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Solar Open 100B (Reasoning)
Upstage
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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Step 5 Preview
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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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 | Up Solar Open 100B (Reasoning) | Top Pick St Step 5 Preview |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | — | $1.00/1M |
| Output Cost | — | $2.70/1M |
| Blended (3:1) | — | $1.43/1M |
| Specifications | ||
| Organization | Upstage | StepFun |
| Release Date | Dec 17, 2025 | Sep 18, 2026 |
| Performance & Speed | ||
| Throughput | — | 91.5 tok/s |
| TTFT | — | 3100ms |
| Latency | — | 24960ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | 10.4 | 43.7 |
| Intelligence | 10.4 | 43.7 |
Key Takeaways
Step 5 Preview offers the best value at $1.00/1M,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.
All models support context windows of ∞+ tokens,suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
Solar Open 100B (Reasoning)
- General-purpose AI
- Versatile applications
Step 5 Preview
- Cost-sensitive applications
- High-volume processing
- Complex reasoning tasks
- Research & analysis
