Other

Union Alpha

stealth/union-alpha

Descriptionfrom OpenRouter

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....

Context length

262,144 tok

Max completion

131,072 tok

Knowledge cutoff

—

Expires

2098-12-31

Added to OpenRouter

9/16/2026

Cache last refreshed

9/18/2026

Primary modality

text+image->text

Source

OpenRouter

Input modalities

textimage

Output modalities

text

Pricing

Field	Per token (USD)	Per million
prompt	0	—
completion	0	—

Supported parameters(6)

max_tokensresponse_formattemperaturetool_choicetoolstop_p

OpenRouter page

Videos

16:54

Stealth Union Alpha: Is this another cheap GPT model? (better than Luna, cheaper than Terra?)

Sep 16, 2026 · YouTube

Rounds

9 answersin this database. A round opens every model's answer to the same prompt.

Sep 16, 2026CodingDrop the slinkyin a video round answer
Sep 16, 2026CodingA hundred thousand of themin a video round answer
Sep 16, 2026CodingThe Cybertruck rallyin a video round answer
Sep 16, 2026Vision & PerceptionCar Identificationin a video round answer
Sep 16, 2026Psychology & Business AcumenThe Labubu PR nightmarein a video round answer
Sep 16, 2026Psychology & Business AcumenThe email you don't want to sendin a video round answer
Sep 16, 2026CodingLast one standingin a video round answer
Sep 16, 2026Vision & PerceptionThe scroll testin a video round answer
Sep 16, 2026CodingTwo kilobytesin a video round answer