“Union Alpha,” an anonymous “stealth” model that appeared on OpenRouter on September 16, 2026.

It’s a reasoning model positioned for research, coding, and agentic workflows, with a 262,144-token context window, a 131,072-token output cap, and text/image input — listed as stealth/union-alpha on OpenRouter. It is free during the preview window. The model claims Union Alpha can deliver frontier-level performance across a broad range of general-purpose tasks.

Resolution criteria

This is a binary (Yes/No) prediction market. To ensure a clear resolution, the creator should specify which developer or organization represents a YES outcome.