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Union Alpha Stealth Model

Union Alpha is a multimodal model built for research, coding, and agentic workflows that delivers frontier-level performance across diverse general-purpose tasks, according to third-party information. The model's documentation lists API parameters including temperature (0 to 2), max_tokens, top_p (0 to 1), frequency_penalty and presence_penalty (-2 to 2), stream, tools, and reasoning_effort, alongside example prompts for system guidance, coding, follow-up conversation, and creative writing.

read1 min views2 publishedSep 17, 2026
Union Alpha Stealth Model
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Union Alpha is a multimodal model designed for research, coding, and agentic workflows. It delivers frontier-level performance across diverse general-purpose tasks.

Paris

System Guidance — Set a helpful system role before asking a question. #

An API (Application Programming Interface) is a set of rules that lets different software programs communicate with each other. For example, a weather app can use an API to request the latest forecast from a weather service.

Coding Example — Ask for a short coding example. #

javascript function reverseString(str) { return [...str].reverse().join(""); }

// Example call: console.log(reverseString("hello")); // "olleh"

Follow-up Conversation — Continue a short conversation with prior assistant context. #

Prioritize **location over amenities** for a short weekend—you’ll get more out of your trip if you spend less time in transit.

- **Your main activity:** Stay near the beach for a relaxing getaway, or near the center for restaurants, sightseeing, and nightlife.
- **Walkability and transport:** Look for cafés and dinner options within walking distance, plus easy access to the airport or train station. If you’re driving, check parking costs.
- **Total

Creative Writing — Generate a compact piece of creative writing. #

The weary day sank softly out of sight,
And left me searching shadows for a spark.
Then one small star unfolded into light—
Enough to lead me gently through the dark.

▶messages[]

array required temperature

number minimum: 0maximum: 2 max_tokens

number exclusiveMinimum: 0 max_completion_tokens

number exclusiveMinimum: 0 top_p

number minimum: 0maximum: 1 frequency_penalty

number minimum: -2maximum: 2 presence_penalty

number minimum: -2maximum: 2 stream

boolean ▶stream_options{}

object ▶tools[]

array tool_choice

response_format

▶modalities[]

array ▶audio{}

object reasoning_effort

string Optional reasoning control; availability and accepted values are model-dependent. id

string object

string created

number model

string ▶choices[]

array ▶usage{}

object

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