Key Takeaways
UI-TARS 7B wins:
- Cheaper output tokens
- Supports vision
Step 3.5 Flash wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Has reasoning mode
- Supports tool calls
Price Advantage
UI-TARS 7B
Benchmark Advantage
Step 3.5 Flash
Context Window
Step 3.5 Flash
Speed
Step 3.5 Flash
Pricing Comparison
Benchmark Comparison
Context & Performance
Capabilities
Feature Comparison
| Feature | UI-TARS 7B | Step 3.5 Flash |
|---|---|---|
Vision (Image Input) | ||
Tool/Function Calls | ||
Reasoning Mode | ||
Audio Input | ||
Audio Output | ||
PDF Input | ||
Prompt Caching | ||
Web Search |
License & Release
| Property | UI-TARS 7B | Step 3.5 Flash |
|---|---|---|
| License | Open Source | Open Source |
| Author | Bytedance | Stepfun-ai |
| Released | Jul 2025 | Jan 2026 |
UI-TARS 7B Modalities
Input
imagetext
Output
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Step 3.5 Flash Modalities
Input
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Output
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