AKA:

Union Alpha (on OpenRouter) stealth/union-alpha

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 was a stealth model, revealed to be Pareto by Unbiased. OpenRouter routed requests to it and was not its developer, owner, or provider. Prompts and completions may be retained by the provider but are not used for training; all other use is governed by the Stealth Model Terms. The free stealth period has ended; use Pareto at https://openrouter.ai/unbiased/pareto.

"Fifteen to twenty-five cents on Fable 5's dollar.

Input $2.50 / Mtok Cached input $0.25 / Mtok Output $7.50 / Mtok"