Union Alpha

Name: Union Alpha
Author: Stealth

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

by Stealth(0) 0 installs

Free

Free account. Installing gives you the manifest plus copy-paste snippets.

See reviews

About

Reference model card from the OpenRouter listing - model stealth/union-alpha. Prices are per million tokens as listed; ratings and installs below are from this marketplace.

Union Alpha

Facts


Vendor	Stealth
Context window	262,144 tokens
Max output	131,072 tokens
Input price	$0.00 / 1M tokens
Output price	$0.00 / 1M tokens
Input	text, image
Output	text
Tool calling	yes
Structured outputs	yes
Reasoning	no
Open weights	no

Endpoint: https://openrouter.ai/api/v1 (OpenAI-compatible), model stealth/union-alpha

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

# after Install: the listing is in your workspace's routing pool - nothing else to configure
curl -s -X POST https://api.opensmartroute.ai/api/v1/route -H 'Authorization: Bearer $OSR_API_KEY' -H 'Content-Type: application/json' -d '{"text": "...", "plan": true}'
# or pin it on the OpenAI-compatible endpoint: {"model": "model-stealth-union-alpha", ...}

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

model-stealth-union-alpha.ocm.jsonjson

{
  "ocm": "1",
  "id": "model-stealth-union-alpha",
  "kind": "llm",
  "name": "Union Alpha",
  "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....",
  "publisher": "Stealth",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "llm",
      "stealth",
      "openrouter",
      "free",
      "tool-calling",
      "image",
      "models"
    ],
    "languages": [
      "en"
    ],
    "modalities": [
      "text",
      "image"
    ],
    "supports_tools": true,
    "supports_streaming": true,
    "context_window": 262144
  },
  "quality_prior": 0.6,
  "examples": [
    "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...."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "models",
      "ref": "1789569723",
      "url": "https://openrouter.ai/stealth/union-alpha",
      "key": "stealth/union-alpha",
      "catalogue": "https://openrouter.ai/api/v1"
    },
    "model": "stealth/union-alpha",
    "pricing": {
      "input_usd_per_1m": 0,
      "output_usd_per_1m": 0
    },
    "max_output_tokens": 131072,
    "output_modalities": [
      "text"
    ],
    "created": 1789569723
  },
  "cost": {
    "usd_per_1k_tokens": 0
  },
  "endpoints": [
    {
      "protocol": "openai",
      "url": "https://openrouter.ai/api/v1"
    }
  ]
}

Fetch it by URL: GET /api/v1/registry/model-stealth-union-alpha/manifest?version=1.0.0

About

Union Alpha

Facts

Use it

Manifest

Reviews