# Union Alpha

> Union Alpha is a stealth preview multimodal model for research, coding, and agentic workflows. It offers frontier-level general-purpose performance with vision in and text out. OpenRouter lists tools and structured output; it does not advertise reasoning on this SKU.

**ID**: `stealth/union-alpha`  
**Creator**: stealth  
**Category**: text  
**Context**: 262K tokens  
**Status**: Disabled (since 2026-09-23) — no longer routable or listed; kept for history/usage reference.  
**Reason**: Previously verified platform routes return 404 for stealth/union-alpha. Hidden from the catalog; configured BYOK fallbacks remain available for users who saved keys.  
**Pricing**: BYOK — billed by your provider  
**Released**: 2026-09-16  
**Web page**: https://anyrouter.dev/model/stealth/union-alpha

**Input modalities**: text, image  
**Output modalities**: text  

**Capabilities**: chat, streaming, coding, agentic, function-calling, vision

**Supported parameters**: max_tokens, temperature, top_p, tools, tool_choice, response_format

## Usage

**Endpoint**: `POST https://anyrouter.dev/api/v1/chat/completions`

```bash
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "stealth/union-alpha",
  "messages": [
    {
      "role": "user",
      "content": "Say hi in 3 words."
    }
  ]
}'
```

## Providers

| Provider | Input | Output |
| --- | --- | --- |
| hermes-agent | $0 | $0 |
| cline-byok | BYOK — billed by your provider | — |
| aihubmix-byok | BYOK — billed by your provider | — |
| hue | $0 | $0 |
| openrouter-byok | BYOK — billed by your provider | — |
| hermes-agent-byok | BYOK — billed by your provider | — |

BYOK routes are billed by your own provider key — AnyRouter charges $0. Rates marked (list) are the provider's published list price.

## Source

- Upstream docs: https://openrouter.ai/stealth/union-alpha