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....
Hosted API only
No self-host path — closed weights.
Union Alpha's weights aren't published. Use it via the access providers below.
Where to use it
Cheapest hosted endpoints.
| Provider | Access | $/M in | $/M out | |
|---|---|---|---|---|
| OpenRouter | api aggregator | — | — | Launch ↗ |
FAQ
Frequently asked.
How do I run Union Alpha?
Union Alpha is a closed-source API model. The cheapest way to access it is through the API providers listed on this page (direct API, aggregators, and hosted chat UIs).
Where can I access Union Alpha?
Union Alpha is available via OpenRouter. Each access option lists its own pricing (per million tokens or hourly hosting).
How much does it cost to run Union Alpha?
Pricing varies per access provider — check each entry in the access table for current rates.
Is Union Alpha open-source or proprietary?
Union Alpha is a proprietary model from Stealth. Access is API-only — there are no public weights to download.
Context window
How much it can remember.
262K tokens
≈ 196,608 English words
4K
32K
128K
1M
Capabilities
What it can do.
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Vision input
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Audio input
·
Video input
·
Function calling
·
Tool use
·
JSON mode
✓
Streaming
·
Fine-tuning