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. It accepts text and image input with text output, a 262K-token context window, and native tool calling plus structured outputs (response_format). Union Alpha is a stealth (cloaked) model: its provider is not disclosed while it is being evaluated. Capabilities and availability may change without notice.
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.orcarouter.ai/v1",
api_key=os.environ["ORCAROUTER_API_KEY"],
)
response = client.chat.completions.create(
model="stealth/union-alpha-free",
messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)max_tokensresponse_formattemperaturetool_choicetoolstop_p| Per request | $0 |
|---|---|
| Billing | Model usage is never charged to your balance |
| Over the limit | HTTP 429 when a limit is hit |
What developers are saying this week
GET /api/public/models/stealth/union-alpha-freeOpen @misc{orcarouter_union_alpha_free,
title = {Union Alpha (Free) API},
author = {stealth},
year = {n.d.},
howpublished = {OrcaRouter},
url = {https://www.orcarouter.ai/models/stealth/union-alpha-free}
}stealth. (n.d.). Union Alpha (Free) API. OrcaRouter. https://www.orcarouter.ai/models/stealth/union-alpha-free