Author's Description
Union Alpha is a multimodal model built for research, coding, and agentic workflows, while delivering frontier-level performance across a broad range of general-purpose tasks. Union Alpha is a stealth model....
Key Specifications
Supported Parameters
This model supports the following parameters:
Features
This model supports the following features:
Performance Summary
Union Alpha, a stealth multimodal model created on September 16, 2026, demonstrates a strong performance profile, particularly in reliability and accuracy for specific tasks. With a context length of 262144, it is designed for research, coding, and agentic workflows. The model exhibits exceptional reliability, achieving a 100% success rate across two benchmarks, indicating it consistently provides usable responses without technical failures. While its speed ranking places it in the 11th percentile, suggesting longer response times compared to other models, its accuracy in critical areas is noteworthy. Union Alpha achieved perfect accuracy (100%) in the Hallucinations (Baseline) benchmark, effectively acknowledging uncertainty for fictional concepts. This performance is particularly impressive given its relatively fast duration for this specific test, making it the most accurate among models of comparable speed. In complex Reasoning (Baseline) tasks, the model scored 98.0% accuracy, placing it in the 90th percentile, showcasing strong capabilities in logic puzzles, pattern recognition, and abstract problem-solving, despite a longer processing duration. Price data is currently unavailable, suggesting potential free tier usage.
Model Pricing
Current Pricing
| Feature | Price (per 1M tokens) |
|---|---|
| Prompt | $0 |
| Completion | $0 |
Price History
Available Endpoints
| Provider | Endpoint Name | Context Length | Pricing (Input) | Pricing (Output) |
|---|---|---|---|---|
|
Stealth
|
Stealth | stealth/union-alpha | 262K | $0 / 1M tokens | $0 / 1M tokens |
Benchmark Results
| Benchmark | Category | Reasoning | Strategy | Free | Executions | Accuracy | Cost | Duration |
|---|
Other Models by stealth
|
|
Released | Params | Context |
|
Speed | Ability | Cost |
|---|---|---|---|---|---|---|---|
| Ox Alpha Unavailable | Aug 20, 2026 | — | 1M |
Video input
Image input
Text input
Text output
|
★★★ | ★★★★★ | $ |