Union Alpha
Model developer: Unbiased · API distributor: OpenRouter
ID kind: historical
Current input price: Unknown · Current output price: Unknown · Currency: USD
Tool calling: Unknown · Structured output: Unknown · Reasoning: Unknown
stealth/union-alpha→ Unbiased · Revealed as a model family; not proof of an identical fixed versionUnion Alpha was a free preview under the anonymous Stealth label. It has been revealed as the Unbiased Pareto family and the original free preview has ended. This does not establish version equality with Pareto 26.9.
Identity source · 2026-10-18T03:14:44.805Z
Formal models: unbiased-pareto-latest · unbiased-pareto-26-9
Data use and retention: The official model page states the provider may retain prompts and completions, but does not use them for training. Official privacy notice
Last verified: 2026-10-18T03:14:44.805Z · Official source 1 · Official source 2 · Official source 3
Official model ID: stealth/union-alpha
Input / output: text, image → text
Official reference rates below; current purchase and API access are not confirmed.
Model developer: Unbiased · Service provider: OpenRouter
Model family: Pareto · Model catalog only; see service-channel quotes
Union Alpha was a free preview under the anonymous Stealth label. It has been revealed as the Unbiased Pareto family and the original free preview has ended. This does not establish version equality with Pareto 26.9.
Documented API context: 262,144 tokens
Official source · Last verified: 2026-10-18T03:13:45.308Z